Exam 12: Hypothesis Testing and One-Sample T Tests

You are doing a one-sample t test. You have 1200 valid cases. How many degrees of freedom will you have?

Answer the questions that follow this SPSS output:   Your research hypothesis is "In the population, the average SAT score is less than 1000.") (SAT) ̅ <1000 A) State the null hypothesis being tested. B) Is this a one-tailed or two-tailed hypothesis? C) Are your sample results consistent with the null hypothesis or the research hypothesis? (null / research) D) What is the probability of getting the sample results you got if the null hypothesis is true? (If this step in hypothesis testing can be skipped, write the word "SKIP".) E) What is your conclusion? (In other words, do you "reject" or "not reject" the null hypothesis based on these results?) F) Are your results statistically significant? (yes / no) G) You can be 95% sure that the true average number of hours spent using the Internet for the population is between __________ and __________.

The research hypothesis is "average length of employment is less than 2 years." What is the correct companion null hypothesis?

What kinds of questions can you answer using a one-sample t test?

The results of a one-sample t test are reported as follows: t = 1.15, df = 120, p = .135. Which of the following is correct?

Write a research hypothesis and its companion null hypothesis that could be tested with a one sample t test.

A researcher does a one-sample t test with 999 cases. How many degrees of freedom does the t test have? __________

If the probability of something happening is .001, it will happen

Answer the questions that follow this SPSS output:   Your research hypothesis is "In the population, the average number of hours spent using the Internet is greater than 3.00." (   ) A) State the null hypothesis being tested. B) Is this a one-tailed or two-tailed hypothesis? C) Are your sample results consistent with the null hypothesis or the research hypothesis? (null / research) D) What is the probability of getting the sample results you got if the null hypothesis is true? (If this step in hypothesis testing can be skipped, write the word "SKIP".) E) What is your conclusion? (In other words, do you "reject" or "not reject" the null hypothesis based on these results?) F) Are your results statistically significant? (yes / no) G) You can be 95% sure that the true average number of hours spent using the Internet for the population is between __________ and __________.

Which hypothesis provides a specific point on the number line around which to form a sampling distribution?

You want to know if the participants in your research project averaged significantly better than a score of 50 on a posttest. What is an appropriate statistical technique to use?

What are the four steps in hypothesis testing?

If the two-tailed significance level is .080, what is the one-tailed significance level? __________

A researcher has done a one-sample t-test. She reports the test's degrees of freedom to be 15. How many cases were there in the sample? __________

When is a one-sample t test used?

Here is a null hypothesis: "In the population, the average reading speed is 120 words per minute." Write the research hypothesis.

If at Step 2 in hypothesis testing, the sample results are consistent with the research hypothesis, what do you do? If consistent with the null, what do you do?

Which hypothesis gets tested in hypothesis testing?

The results of a one-sample t test are reported as follows: t = 3.15, df = 430, p = .035. Which of the following is correct?

Here is a research hypothesis: "In the population, the average age is greater than 30." Write the null hypothesis.