1. The interquartile range is the difference between the _____.
A) first and third quartiles
2. The variance is equal to the _____.
A) standard deviation
3. Generally, which of the following is the least appropriate measure of central tendency for a data set that contains outliers?
A) Mean
4. An important measure of location for categorical data is the _____.
A) Mode
5. The measure of variability easiest to compute, but seldom used as the only measure, is the _____.
A) range
6. In computing descriptive statistics for grouped data, the _____ are used to approximate the data values in each class.
A) class midpoints
7. Which of the following is NOT a measure of variability of a single variable?
A) covariance
8. 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 _____.
A) 68%
9. A box plot is a graphical representation of data that is based on _____.
A) a five-number summary
10. The coefficient of variation indicates how large the standard deviation is relative to the _____.
A) mean
11. Which of the following descriptive statistics is NOT measured in the same units as the data?
A) variance
12. A numerical measure computed from a sample, such as sample mean, is known as a _____.
sample statistic
13. A numerical measure, such as a mean, computed from a population is known as a _____.
population parameter
14. The mean of a sample is _____.
A) computed by summing all the data values and dividing the sum by the number of items
15. A graph with skewness -1.8 would be which of the following?
A) highly skewed right
16. In statistics, what does IQR mean?
A) inter-quartile range
17.After the data have been arranged from smallest value to largest value, the value in the middle is called the _____.
A) median
18. If a data set has an even number of observations, the median _____.
A) is the average value of the two middle items when all items are arranged in ascending order
19. The most frequently occurring value of a data set is called the _____.
A) mode
20. Excel’s _____ function can be used to compute the mean.
A) AVERAGE
21. Excel’s _____ function can be used to compute the middle value of an ordered data set.
A) MEDIAN
22. Excel’s _____ function can be used to compute the data value occurring most frequently.
A) MODE.SNGL
23. The five-number summary consists of what five statistical measures?
A) min, Q1, median, Q3, max
24. In computing the pth percentile, if the index i is an integer the pth percentile is the _____.
A) average of data values in positions i and i + 1
25. The 50th percentile is the _____.
A) median
26. The 75th percentile is also the _____.
A) Third quartile
27. The first quartile _____.
A) is the same as the 25th percentile
28. Which of the following is NOT a measure of location?
A) variance
29.The median of a sample will always equal the _____.
A) variance
30.The measure of location most likely to be influenced by extreme values in the data set is the _____.
A) Mean
31. The difference between the largest and smallest data values is the _____.
A) range