Exam 7: Testing One Sample Mean

For a z-statistic of -1.34, the decision about the null hypothesis is ______.

A researcher calculates a value of 3.21 for a t-statistic. For df = 20 and alpha = .05 (two-tailed), which of the following is the MOST accurate?

If the value of the t-statistic calculated from a set of data ______ the critical value, you would say ______.

A ______ symbol in the ______ hypothesis implies this hypothesis is ______.

Although their formulas are similar, one difference between the z-score (z) and the t-statistic (t) is that ______.

You collect data from a sample of 150 people, and calculate a mean of 6.87 and a standard deviation of 3.69. What is the value for the standard error of the mean ?

A researcher conducted an analysis that supported the research hypothesis that SJSU students spend less on textbooks than the average California college student. As a result of this finding, imagine you hypothesize that SJSU freshmen owe less on their credit cards than the average college freshman. To test this hypothesis, a group of college students are asked, "If you have your own credit card(s), how much do you currently owe on them?" The responses of some of the students in this class are summarized as: N = 25 = 834.53 S = 169.40 According to a recent study, the average college freshman owes $900 on their credit cards (Arano, 2006). Based on your calculations, which of the following best represents the decision regarding the null hypothesis?

The statement µ > 3 is an example of a ______.

Which of the following can be a negative number in testing the mean of a sample?

In testing the mean of a sample, the sample mean is transformed into a ______ statistic in order to ______.

Which of the following would be the most accurate way to report the following z-test?

Looking at the ______ for a statistic like a t-statistic provides an indication of the sample size in a study.

A ______ symbol in the ______ hypothesis implies this hypothesis is ______.

A researcher has calculated a z-statistic of 1.92. For a two-tailed test with alpha () = .05, which of the following is the most appropriate?

You calculate a value of 1.17 for the t-statistic and find falls in the region of non-rejection. As a result, the most appropriate conclusion is that you ______.

You test the mean of a sample of 19 people and calculate a value of 2.14 for the t-statistic. For α = .05 (two-tailed), which of the following decisions is MOST appropriate?

Imagine that for a population of 200, the mean is 20.23 with a standard deviation of 5.12. What is the population standard error of the mean ?

A researcher draws a random sample of 25 people from a population and calculates the mean of their IQs. If she were to repeat this process of drawing samples and calculating means an infinite number of times, the sample means could be used to create ______.

Which of the following is a correctly stated alternative hypothesis?

A study based on a sample of 13 participants calculates a value of 1.89 for the t-test for a single mean. For alpha (α) = .05 (two-tailed), which of the following is the correct way to present this analysis?