Exam 8: Hypothesis Testing I: the One-Sample Case

Given that the null hypothesis is actually true,the probability of Type II error is

A one-tailed test of significance could be used whenever

In a one-tailed test of hypothesis,the entire ____ should be placed in either the upper or lower tail of the ____.

An alpha of 0.01 means that a decision to ____ the null hypothesis has a ____ in 100 chance of being incorrect

In a t test of differences between means,increasing sample size will affect

Which assumption must be true in order to justify the use of hypothesis testing?

The critical region is

As the Critical Region decreases in size,

A researcher is interested in the effect that neighborhood crime-watch efforts have on the crime rate in the inner city,but he is unwilling to predict the direction of the difference.The appropriate test of hypothesis would be

The research hypothesis (H₁)typically states what the researcher expects to find and

If we reject a null hypothesis which is in fact true,we

Sixty percent of the respondents in a random sample drawn from a neighborhood are Democrats.The community as a whole is 75% Democrat.The difference between sample and population has been tested and the null hypothesis has been rejected.What may we conclude?

Which of the following are we unlikely to know when conducting a test of hypothesis in the one sample case?

In hypothesis testing,the ____ is the critical assumption,the assumption which is actually tested.

In order to conduct a test of hypothesis with means or proportions,the sampling distribution must be

A researcher selected a sample of 56 former student leaders from a list of graduates of a large university.She discovered that it had taken an average of 4.97 years for these graduates to finish their degrees,with a standard deviation of 1.23.The average for the entire student body is 4.56 years.Is the difference statistically significant? Follow the five-step model and state all important decisions.Make sure that you interpret the results in terms of the original research question.

Which of the following must be normally distributed in order to proceed with hypothesis testing of means and proportions?

The research and null hypotheses ____ each other.

Do students who are members of fraternities or sororities have GPAs different from the student body as a whole? A random sample of 123 "Greeks" has been selected from the student body of a large university.The GPA for the student body as a whole is 2.59 and the mean for the sample is 2.47 with a standard deviation of 0.34.Is the difference statistically significant? Follow the five-step model and state all important decisions.Make sure that you interpret the results in terms of the original research question.

If the test statistic falls in the critical region,we