- A boxplot is a graphical representation of data that is based on _ five number summary
- A graph with skewness -1.8 would be which of the following? highly skewed left
- A graphical presentation of the relationship between two quantitative variables is a scatter diagram
- A numerical measure of linear association between two variables is the covariance
- A numerical measure, such as a mean, computed from a population is known as a population parameter
- A numerical measure, such as a mean, computed from a population is known as a _____. population parameter
- A researcher has collected the following sample data. The mean of the sample is 5.
3 5 12 3 2
Refer to Exhibit 3-2. The interquartile range is 2 - A researcher has collected the following sample data. The mean of the sample is 5.
3 5 12 3 2
Refer to Exhibit 3-2. The standard deviation is 4.062 - A researcher has collected the following sample data.
5 12 6 8 5
6 7 5 12 4
Refer to Exhibit 3-1. The mode is 5 - A Scanner Data User Survey of 50 companies found that the average amount spent on scanner data per category of consumer goods was $387,325 (Mercer Management Consulting, Inc., April 24, 1997). The $387,325 is an example of Both quantitative data and a descriptive statistic are correct
- A tabular summary of a set of data showing the fraction of the total number of items in several nonoverlapping classes is a relative frequency distribution
- A tabular summary of data showing the percentage of items in each of several nonoverlapping classes is a percent frequency distribution
- After the data have been arranged from smallest value to largest value, the value in the middle is called the _____. Median
- Categorical data may be either numeric or nonnumeric
- Categorical data are labels used to identify attributes of elements
- Data that provide labels or names for groupings of like items are known as categorical data
- Generally, which of the following is the least appropriate measure of central tendency for a data set that contains outliers? Mean
- If the data distribution is symmetric, the skewness is _____. 0
- In a questionnaire, respondents are asked to mark their gender as male or female. Gender is an example of a categorical variable
- In a questionnaire, respondents are asked to record their age in years. Age is an example of a quantitative variable
- In a sample of 3,200 registered voters, 1,440, or 45%, approve of the way the President is doing his job.
Refer to Exhibit 1-2. A political pollster states, “Forty five percent of all voters approve of the President.” This statement is an example of statistical inference - In a sample of 800 students in a university, 160, or 20%, are Business majors. Based on the above information, the school’s paper reported that “20% of all the students at the university are Business majors.” This report is an example of statistical inference
- In constructing a frequency distribution, as the number of classes are decreased, the class width increases
- Information on the type of industry is provided for a sample of 50 Fortune 500 companies.
Industry Type Frequency
Banking 7
Consumer Products 15
Electronics 10
Retail 18
Refer to Exhibit 2-2. The number of industries that are classified as retail is 18 - Information on the type of industry is provided for a sample of 50 Fortune 500 companies.
Industry Type Frequency
Banking 7
Consumer Products 15
Electronics 10
Retail 18
Refer to Exhibit 2-2. The relative frequency of industries that are classified as banking is 0.14 - Ordinary arithmetic operations are meaningful only with quantitative data
- Positive values of covariance indicate a positive relation between the x and the y variables
- Since the mode is the most frequently occurring data value, ____ more than one mode can exist
- The ages of employees at a company represent quantitative data
- The coefficient of variation indicates how large the standard deviation is relative to the mean
- The coefficient of variation indicates how large the standard deviation is relative to the _____. Mean
- The correlation coefficient cannot be larger than 1
- The difference between the lower class limits of adjacent classes provides the class width
- The empirical rule states that, for data having a bell-shaped distribution, the portion of data values being within one standard deviation of the mean is approximately _____. 68%
- The interquartile range is the difference between the third quartile and the first quartile
- The interquartile range is the difference between the first and third quartiles
- The measure of dispersion that is influenced most by extreme values is the _____. Range
- The measure of location most likely to be influenced by extreme values in the data set is the _____. Mean
- The measure of location that is the most likely to be influenced by extreme values in the data set is the mean
- The measure of variability easiest to compute, but seldom used as the only measure, is the _____ range
- The number observations in a complete data set having 10 elements and 5 variables is 10
- The numbers of hours worked (per week) by 400 statistics students are shown below.
Number of hours, Frequency
0-9, 20
10-19, 80
20-29, 200
30-39, 100
Refer to Exhibit 2-1. The class width for this distribution is 10 - The numbers of hours worked (per week) by 400 statistics students are shown below.
Number of hours, Frequency
0-9, 20
10-19, 80
20-29, 200
30-39, 100
Refer to Exhibit 2-1. The cumulative relative frequency for the class of 20 – 29 is 0.75 - The numbers of hours worked (per week) by 400 statistics students are shown below.
Number of hours, Frequency
0-9, 20
10-19, 80
20-29, 200
30-39, 100
Refer to Exhibit 2-1. The percentage of students working 19 hours or less is 25% - The owner of a factory regularly requests a graphical summary of all employees’ salaries. The graphical summary of salaries is an example of descriptive statistics
- The standard deviation of a sample of 100 observations equals 64. The variance of the sample equals 4,096
- The sum of deviations of the individual data elements from their mean is always equal to zero
- The sum of deviations of the individual data elements from their mean is _____. always equal to zero
- The sum of frequencies for all classes will always equal the number of elements in a data set
- The symbol σ² is used to represent the _____. Variance
- The value of the sum of the squared deviations from the mean, i.e., must always be _____. at least zero
- The variance is equal to the ____ squared value of the standard deviation
- The weights (in pounds) of a sample of 36 individuals were recorded and the following statistics were calculated
mean = 160 range = 60
mode = 165 variance = 324
median = 170
The coefficient of variation equals 11.25% - When the data are labels or names used to identify an attribute of the elements, the variable has which scale of measurement? Nominal
- When the data have the properties of interval data and the ratio of two values is meaningful, the variable has which scale of measurement? Ratio
- When the data have the properties of ordinal data and the interval between observations is expressed in terms of a fixed unit of measure, the variable has which scale of measurement? Interval
- Which of Excel’s functions can be used to compute the population standard deviation? Population standard deviation cannot be computed using an Excel function.
- Which of the following descriptive statistics is NOT measured in the same units as the data? Variance
- Which of the following graphical methods is most appropriate for qualitative data? pie chart
- Which of the following is an example of qualitative data? social security number
- Which of the following is not a measure of location? Variance
- Which of the following symbols represents the mean of a population? Μ
- Which of the following symbols represents the mean of a sample? x̅
- Which of the following symbols represents the mean of the population? M
- Which of the following symbols represents the size of a population? N
- Which of the following symbols represents the size of a sample? n
- Which of the following symbols represents the standard deviation of a population? Σ
- Which of the following symbols represents the variance of a population? σ²
- Which of the following values of r indicates the strongest correlation? -.9
- Which scale of measurement can be either numeric or nonnumeric? nominal and ordinal
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