Econ

What does the interquartile range describe? Question 5 options: 1) The range of the lower 50% of the observations 2) The range of the middle 50% of the observations 3) The range of the upper 50% of the observations 4) The ranges of the lower 25% and the upper 25% of the observations

2

In a distribution, the second quartile corresponds with the __________. Question 8 options: 1) mean 2) median 3) mode 4) variance

3

Refer to the following frequency distribution of days absent during a calendar year by employees of a manufacturing company: Days Absent Number of employees 0 up to 3 60 3 up to 6 31 6 up to 9 14 9 up to 12 6 12 up to 15 2 How many employees were absent six or more days? Question 6 options: 1) 8 2) 4 3) 22 4) 31

3

The distribution of a sample of the outside diameters of PVC pipes approximates a symmetrical, bell-shaped distribution. The arithmetic mean is 14.0 inches, and the standard deviation is 0.1 inches. About 68% of the outside diameters lie between what two amounts? Question 17 options: 1) 13.5 and 14.5 inches 2) 13.0 and 15.0 inches 3) 13.9 and 14.1 inches 4) 13.8 and 14.2 inches

3

The range for Pearson's coefficient of skewness is/are ______. Question 1 options: 1) values greater than or equal to zero or always positive 2) values less than or equal to zero or always negative 3) both positive and negative values 4) values between −1 and +1

3

The sample variance of hourly wages was 10. What is the sample standard deviation? Question 12 options: 1) $1.96 2) $4.67 3) $3.16 4) $10.00

3

______ is an example of a qualitative variable. Question 18 options: 1) Number of children in a family 2) Weight of a person 3) Color of ink in a pen 4) Miles between oil changes

3

A sample of small bottles and their contents has the following weights (in grams): 4, 2, 5, 4, 5, 2, and 6. What is the sample variance of bottle contents weight? Question 2 options: 1) 6.92 2) 4.80 3) 1.96 4) 2.33

4

For a relative frequency distribution, relative frequency is computed as ______. Question 4 options: 1) the class width divided by the class interval 2) the class midpoint divided by the class frequency 3) the class frequency divided by the class interval 4) the class frequency divided by the total number of observations

4

Question 14 (1 point) Saved The following graph is a ______. Question 14 options: 1) dot plot 2) stem-and-leaf display 3) box plot 4) scatter diagram

4

The sample mean ______. Question 7 options: 1) is always equal to the population mean. 2) is always smaller than the population mean. 3) is found by adding the data values and dividing them by (n − 1). 4) is found by adding all data values and dividing them by n.

4

Based on the Empirical rule, what percent of the observations will lie within plus or minus two standard deviations from the mean? Question 10 options: 1) 95% 2) 5% 3) 68% 4) 2.5%

1

Refer to the following breakdown of responses to a survey of "Are you concerned about being tracked while connected to the Internet?" Response Frequency Very concerned 140 Somewhat concerned 40 No concern 20 What type of chart should be used to show relative class frequencies? Question 16 options: 1) A pie chart 2) A bar chart 3) A histogram 4) A frequency polygon

1

The Equal Employment Opportunity Act requires employers to classify their employees by gender and national origin. Which level of measurement is this? Question 11 options: 1) Nominal 2) Ordinal 3) Interval 4) Ratio

1

The main purpose of descriptive statistics is to Question 19 options: 1) organize, summarize, and present data in an informative way. 2) make inferences about a population. 3) determine if the data adequately represent the population. 4) gather or collect data.

1

The final rankings of the top 20 NCAA college basketball teams are an example of which level of measurement? Question 3 options: 1) Nominal 2) Ordinal 3) Interval 4) Ratio

not 3, 2

Income is a variable often used in business and economics. Income is an example of a variable that uses the ______. Question 13 options: 1) ordinal scale 2) nominal scale 3) ratio scale 4) interval scale

not 4, 3

Refer to the following information from a frequency distribution for heights of college women recorded to the nearest inch: the first two class midpoints are 62.5" and 65.5". What are the class limits for the third class? Question 15 options: 1) 64 and up to 67 2) 67 and 69 3) 67 and up to 70 4) 66 and 68

not 4, 3

What statistics are needed to draw a box plot? Question 20 options: 1) The minimum, maximum, median, first and third quartiles 2) The median, mean, and standard deviation 3) The median and interquartile range 4) The mean and standard deviation

1