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73 Cards in this Set
- Front
- Back
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Nominal
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Categories.
Data on the lowest level is said to be Nominal |
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Ordinal
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Rank or Order.
putting some kind of importance on something |
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Interval
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Legitimate starting point
Ex. Temperature |
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Ratio
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Values are meaningful.
"true |
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a population is a collection of all individuals, objects, or measurements of interest?
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True
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a sample is a portion of part of the population of interest?
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True
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To infer something about a population, you must take a random sample from the population?
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True
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The techniques used to find out something about a population, such as their average weight, based on a sample are referred to as descriptive statistics?
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False
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There are four levels of measurement - qualitative, quantitative, discrete, and continues?
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False
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Data that can only be classified into categories is nominal data?
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True
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Categorizing voters as Democrats, Republicans, and Independents is an example of interval level measurement?
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False
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The order that runners finish in a race would be an example of continuous data?
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False
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The number of children in a family is discrete data?
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True
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A frequency distribution is grouping of data into classes showing the number of observations in each class?
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True
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The midpoint of a class, which is also called a class mark, is halfway between the lower and upper limits
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True
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In constructing a frequency distribution, you should try to have open-ended classes such as "upper $100" and "upper $1,000 and over"?
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False
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When constructing a frequency distribution, try to include overlapping stated class limits, such as $100 up to 201, 200 up to 301, and 300 up to 401?
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False
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To convert to a frequency distribution, divide each class frequency by the sum of the class frequencies?
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True
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A cumulative frequency distribution is used when we want to determine how many observations lie above and below certain values?
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True
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A frequency polygon is a very useful graphic technique when comparing two or more distributions?
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True
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Simple bar charts may be constructed either horizontally or vertically?
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True
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The geometric mean is the nth root of n observations?
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True
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An index number is a percent that measures the change in price, quantity, value, or some other item of interest from one time to another?
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True
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The base number for most indexes is 1
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False
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Two methods of computing a weighted price index are the Laspeyres' method and Paasche's method?
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True
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The Laspeyres' methos uses the amounts consumed in the base period, qo, as weights to determine a price index?
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True
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The consumer price index measures the change in prices of fixed market basket of goods and services from one period to another?
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True
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One function of CPI is to allow consumers to determine the degree to which their purchasing power is being eroded by price increases and as such, it is a yardstick for revising wages, pensions and other income payments to keep pace with changes in prices?
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True
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Which of the following is an example of continues data?
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Family Income
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A bank asks customers to evaluate the drive-thru service as to good, average, or poor. Which level of measurement is this classification?
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Ordinal
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A questionnaire contained a question regarding martial status. The respondent checked either single, married, divorced, separated, or widowed. What is the scale of measurement for this question?
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Nominal
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What type of data is the number of gallons of gasoline pumped by a filling station during a day?
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Continuous
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What type of data is the number of robberies reported in your city?
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Discrete
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What level of measurement is the price of an admission ticket to a movie theater?
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Ratio
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Your height and weight are examples of which level of measurement?
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Ratio
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Which of the following is an example of attribute data?
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Color of ink in a pen
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Which one of the following is NOT an example of discrete data?
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number of miles between New York City and Chicago
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The monthly salaries of a sample of 100 employees were rounded to the nearest ten dollars. They ranged from a low of $1,040 to high of $1,720. If we want to condense the data into seven classes, what is the most convenient class interval?
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$100
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In a frequency distribution, what is the number of observations in a class called?
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Class
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In a simple line chart, where is time plotted?
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On the X-axis
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Which measure of central tendency is used to determine the average annual percent increase?
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Geometric mean
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Production of passenger cars in Japan increased from 3.94 million in 1990 to 6.74 million in 2000. What is the geometric mean annual percent increases?
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5.5
First: 6.74/3.94 GM = [10 SR 1.710659898 - 1] * 100 = 5.5 |
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The numbere of students at a local university increased from 2,500 students to 5000 students in 10 years. Based on a geometric mean, the university grew at an average percentage rate of
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7.1 percent per year
GM = (10 SR 2-1)*100= 7.77346254` |
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If the average hourly earnings in mining in 1978 was $7.67 and for the most recent month it was $14.90, what is the index of hourly earnings for the most recent month based on 1978?
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194.3
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What is the symbol used to designate a base period price?
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P0
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What is the usual index number associated with the base period for the CPI?
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100
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Which method for computing a weighted price index uses current year weights?
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Paasche
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What is another name for the unweighted method of computing an index?
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Simple aggregate
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Which index measures the change in the prices of a fixed market basket of goods and services from one time period to another?
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Consumer Price Index
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List the four reasons given in class for NOT taking a census?
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Time
Cost Size Destructive |
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The arithmetic mean is the SUM of the observations divided by the total number of observations?
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True
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The mode is the value of the observations that appears most frequently?
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True
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Extremely high or low scores affect the value of the median?
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False
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There are always as many values above the mean as below it?
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False
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In a positively skewed distribution, the mode is greater than the median?
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False
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The inter-quartile range the difference between the values of the first and third quartile, indicating the range of the middle fifty percent of the observations?
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True
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The three quartiles divide a set of data into four quarters?
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True
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There are 99 percentiles that divide a distribution into 100 parts?
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True
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If a frequency distribution is open-ended, the variance cannot be determined?
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True
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An outlier is a value in a data set that is inconsistent with the rest of the data?
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True
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Which measures of central tendency always have but one value for a set of grouped or ungrouped data?
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Mean & Median
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Which measures of central tendency are not affected by extremely low or extremely high values?
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Mode & Median
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Which measure of central tendency is used to determine the average annual percent increase?
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Geometric Mean
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The mean, as a measure of central tendency would be inappropriate for which one of the following?
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Martial status of college students at a particular university
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Which of the following measures of dispersion are based on deviations from the mean?
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Variance
Standard Deviation Mean Deviation |
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Which measure of dispersion disregards the algebraic signs (plus and minus) of each difference between X and the mean?
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Mean Deviation
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If a distribution is highly skewed, what measure of central tendency should be avoided?
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Mean
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What is the smallest measure of central tendency in a positively skewed distribution?
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Mode
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According to the Empirical Rule, about what percent of the observations lies with plus and minus one standard deviation of the mean?
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68%
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What does the sum of the deviation of each value from the mean equal?
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Zero
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if two sets of data are in different units, we can compare the dispersion by using?
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Coefficient of Variation
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A student scored a 92 on the midterm, 89 on the final exam and 83 on the term project. If these three components are weighted at 35%, 45%, and 20%, respectively, what is the weighted mean for the course?
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88.85%
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The following represents a sample of the number of overtime hours worked by ten bus drivers last month:
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Mean: 12
Median: 10.5 Mode: 10 Variance: 10.22 Standard Deviation: 3.2 Range: 9 |
