Download Chapter 8 review answers File

TRY TO WORK OUT THE FOLLOWING ANSWERS WILL BE GIVEN LATER:
Chapter 8
1. What is the relationship of the standard deviation of the sampling
distribution of the mean to the standard deviation of the population under
study? __sigma / sqrt(n)_________
2. What is a characteristic of a population called?
__parameter_____________
3. As the sample size (n) increases, what happens to the spread or dispersion
of the distribution of the sample means? ______decreases _____
4. If the sample size equals the population size, what is the sampling error? _0________
5. The American Auto Association reports the mean price per gallon of regular
gasoline is $3.10 with a population standard deviation of $0.20. Assume a
random sample of 16 gasoline stations is selected and their mean cost for
regular gasoline is computed. What is the standard error of the mean in this
experiment?
Divide 0.20 / sqrt( 16) = 0.05
6. The American Auto Association reports the mean price per gallon of regular
gasoline is $3.10 with a population standard deviation of $0.20. Assume a
random sample of 16 gasoline stations is selected and their mean cost for
regular gasoline is computed. What is the probability that the sample mean
is between $2.98 and $3.12?
0.6472