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PSYC 3002 Week 4 Test

1. After determining your one-tailed t-test is significant, what should you do?
2. Researchers want to see if people taking a new medication for Type II diabetes have lower blood sugar than the population of people with Type II diabetes. The researchers should use a
3. A researcher wishes to test the hypothesis that a persuasive message about our government will change people’s attitudes toward politicians. Each of 20 participants’ attitudes is measured before and after receiving the message. The correct procedure to use is:
4. The t distribution that you use to find your critical values closely resembles the normal distribution when the:
5. In general, a zero correlation means
6. A U-shaped pattern is an example of a
7. Suppose you tested two age groups on the number of details they could recall from a paragraph. The mean for the older group is 16, and the mean for the younger group is
8. Furthermore, suppose you fail to reject the null hypothesis for this test. What best accounts for the difference between these sample means?
9. We should do a scatterplot of the data when we compute a correlation because the scatterplot allows us to
10. What are the consequences of having a restricted range?
11. Suppose you find a -.65 correlation coefficient among sleepiness and happiness, and you compute the proportion of variance accounted for. This tells you that of the variance in happiness is accounted for by sleepiness
12. When using a p value to determine statistical significance for a one-sample t-test
13. One-tailed tests are used when we predict the of the relationship.
14. A marriage therapist conducts a study and finds a positive linear relationship between the happiness levels of wives and the happiness levels of husbands. This tells the therapist that
15. If a researcher reports a one-sample t-test with df = 24, how many individuals participated in this study?
16. Suppose you are using regression to predict how a person’s blood alcohol level is impacted by the number of drinks they consume. The predictor is the and the criterion is the.
17. Suppose the average reading speed of 15 randomly selected elementary school students is 25, and the average reading speed of 15 randomly selected middle school students is. You compute an independent-samples t-test, and your obtained t value is 5.72, which is statistically significant. What is the most appropriate conclusion?
18. Suppose a poll has been conducted on Americans’ favorable attitudes towards a certain If it is reported that Americans are 56% plus or minus 4% in favor of the issue, which of the following is not a possible value represented within the margin of error?
19. If a researcher uses a one-tailed test to test the significance of a correlation, he could be hypothesizing
20. When is a one-sample t-test used instead of a z-test?