B. 58 points
C. 118 points
D. 122 points
E. 127 points
Which of the following is not an advantage of stratified random sampling over simple random
sampling?
A. When done correctly, a stratified random sample is less biased than a simple random sample.
B. When done correctly, a stratified random sampling process has less variability from sample to
sample than a simple random sample.
C. When done correctly, a stratified random sample can provide, with a smaller sample size, an
estimate that is just as reliable as that of a simple random sample with a larger sample size.
D. A stratified random sample provides information about each stratum in the population as well
as an estimate for the population as a whole, and a simple random sample does not.
E. When done correctly, a stratified random sample can provide a more reliable estimate than a
simple random sample using the same sample size.
- The correlation between height in inches and weight in pounds for a particular class is 0.65. If the
heights are converted from inches to centimeters, what will the correlation be? (1 in. = 2.54 cm)
A. –0.65
B. –0.26
C. 0.10
D. 0.26
E. 0.65 - Breakfast cereals have a wide range of sugar content. Some cereals contain High Fructose Corn
Syrup (HFCS) as a source of sugar and some do not. The boxplots above show the total sugar
content of different types of cereal for those containing HFCS and for those that do not. Which
statement is true based on the boxplots?
A. The number of cereals with HFCS is about the same as the number of cereals without HFCS.
B. The cereals with HFCS have a greater interquartile range than the cereals without HFCS.
C. The cereals without HFCS have a greater range than the cereals with HFCS.
D About half the cereals without HFCS have less sugar than about three-fourths of the cereals with
HFCS.
E. About half the cereals with HFCS have more sugar than about three-fourths of the cereals
without HFCS.