Since n must be an integer, choose n = 1537.
From Chapter 8
The correct answer is (e). A random sample from a population is one in which every member of the
population is equally likely to be selected. A simple random sample is one in which every sample of
a given size is equally likely to be selected. A sample can be a random sample without being a simple
random sample.
- From Chapter 6
The correct answer is (e). The teachers are interested in showing that the average teacher salary is
low. Because the mean is not resistant, it is pulled in the direction of the few higher salaries and,
hence, would be higher than the median, which is not affected by a few extreme values. The teachers
would choose the median. The mode, standard deviation, and IQR tell you nothing about the average
salary. - From Chapter 9
The correct answer is (b). P (at least one of them will ask her) = P (A or B) = 0.72.
P (they both ask her) = P (A and B) = 0.18.
P (Alfred asks her) = P (A) = 0.6.
In general, P (A or B) = P (A) + P (B) – P (A and B). Thus, 0.72 = 0.6 + P (B) – 0.18 P (B) =
0.30. - From Chapter 12
The correct answer is (b).
(Using the TI-83/84, we find normalcdf(1.06,100) = 0.1446. )
From Chapter 10
The correct answer is (d). Although all three of the statements are true of a sampling distribution,
only III is a statement of the central limit theorem.
- From Chapter 14
The correct answer is (a).