There are two statistics classes. The first has 250 students, and the second has 200 students. In the first class, the students are instructed to toss a coin 20 times and record the value of, the proportion of heads. The instructor then makes a histogram of the 250 values ofobtained. In the second class, the students are instructed to toss a coin 40 times and record the value of, the proportion of heads. The instructor then makes a histogram of the 200 values ofobtained. The histogram ofvalues for the first class should be

a. less variable since it is based on a larger number of students.

b. more biased since it is based on a smaller number of tosses.

c. more variable since it is based on a smaller number of tosses.

Suppose you are going to roll a die 60 times and record, the proportion of times that a 1 or a 2 is showing. The sampling distribution ofshould be centered about

a. 20.

b. 1/6.

c. 1/3.

A simple random sample of 1000 Americans found that 61% were satisfied with the service provided by the dealer from which they bought their car. A simple random sample of 1000 Canadians found that 58% were satisfied with the service provided by the dealer from which they bought their car. The sampling variability associated with these statistics is

a. much smaller for the sample of Canadians since the population of Canada is smaller than that of the United States, hence the sample is a larger proportion of the population.

b. about the same.

c. much larger for the Canadians since Canada has a lower population density than the United States, hence Canadians tend to live farther apart which always increases sampling variability.