v. Find the margin of error given the following: 99% confidenceinterval;

n = 68, x bar = 4156 and Std dev. = 839. ________

a. 1298    b.   237   c. 262    d. 8

vi. When do Type II errors occur?________

a. We decide to reject the null hypothesis when the nullhypothesis was actually true.

b.   We fail to reject the null hypothesis when thenull hypothesis is actually false.

c.   They occur in both cases.

vii. A standard score of z = 1.00 for an observation means:_________

a. The mean of the distribution lies 1 standard deviations belowthe observation.

b. The observation lies 1 standard deviations below themean.

c. The observation lies 1 standard deviations above themean.

d. The observation lies 1 means below the standarddeviation.

viii. Given a 90% and a 95% confidence interval, which of thefollowing is true?

1.   The 90% confidence interval is wider than the 95%confidence interval.
2. There is a better chance that the true mean will be found inthe 95% confidence interval.

3. None of the above.

ix. The number of hours per week that high school juniors watchTV is normally distributed with a mean of 8 hours and a standarddeviation of 2 hours. If 100 students are chosen at random, findthe probability that the mean for that sample is between 8.2 and8.8

1. 0.1598     b.0.1586     c. 0.1156    d.0.1152

Note: standard deviation/ the square root of n.

Check out the Central Limit Theorem