66.

In 1940 the average size of a U.S. farm was 174 acres. Let's say that the standard deviation was 55 acres. Suppose we randomly survey 38 farmers from 1940.

1. In words, = _____________
2. In words, X = _____________
3. X ~ _____(_____,_____)
4. The IQR for x is from _______ acres to _______ acres.

67.

Determine which of the following are true and which are false. Then, in complete sentences, justify your answers.

1. When the sample size is large, the mean of X is approximately equal to the mean of .
2. When the sample size is large, x is approximately normally distributed.
3. When the sample size is large, the standard deviation of x is approximately the same as the standard deviation of .