HW5

1) A Type II error is committed when

• A) you reject a null hypothesis that is true.
• B) you don't reject a null hypothesis that is true.
• C) you reject a null hypothesis that is false.
• D) you don't reject a null hypothesis that is false.

2) The power of a test is measured by its capability of

• A) rejecting a null hypothesis that is true.
• B) not rejecting a null hypothesis that is true.
• C) rejecting a null hypothesis that is false.
• D) not rejecting a null hypothesis that is false.

3) If thep-value is less thanin a two-tail test,

• A) the null hypothesis should not be rejected.
• B) the null hypothesis should be rejected.
• C) a one-tail test should be used.
• D) no conclusion should be reached.

4) If you know that the level of significance () of a test is 5%, you can tell that the probability of committing a Type II error () is

• A) 2.5%.
• B) 95%.
• C) 97.5%.
• D) unknown.

5) The standard error of the mean

• A) is never larger than the standard deviation of the population.
• B) decreases as the sample size increases.
• C) measures the variability of the mean from sample to sample.
• D) All of the above.