07 Jun PSYC 355 Exam 1 NEW
Exam 1 Psych 355
3. A p level of 0.05 corresponds to a confidence level of __________%
4. In a within-groups design where one group is measured twice over time, the appropriate hypothesis test is an:
7. Why do we divide by N-1 rather than by N when estimating a population standard deviation from the sample standard deviation?
8. The paired-samples t test has three assumptions, including all but:
9. We have learned three t tests, including all of the following except
10. The single-sample t test compares a sample mean to a population mean when:
12. According to the null hypothesis, the mean difference for the comparison distribution in a paired-samples t test is:
13. For an independent-samples t test, there were 14 participants in Group 1 and 17 participants in Group 2. The total degrees of freedom were:
14. A researcher conducts a single-sample t test and finds statistical significance at the 0.01 level. The effect size is then calculated and found to be 0.04. What might you conclude about the findings?
16. In an ______, one sample is compared to a population for which we only know the mean during hypothesis testing.
22. The critical cutoffs for a two-tailed, paired-samples t test with seven participants at a p level of 0.01 are:
24. Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. They randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. The dependent variable in this study is:
27. A clinical researcher was interested in determining whether his interventions were effective in minimizing depression symptoms among his participants. The assess the effectiveness of his treatment program, he administered a depression inventory prior to his treatment and after his treatment. He hypothesized that depression scores would lower at a time two compared to time one. He then compared the mean differences between the two groups and found that his treatment was effective. The dependent variable in this study is:
28. To determine our critical values or cutoffs for an independent-samples t test, we use:
29. The formula H0: U1 = Uz is used to represent the:
30. Following are the results of an independent-samples t test: t(18) = -2.11, p<0.05. In the current example, the degrees of freedom are:
34. A researcher investigates if the extent to which people care abuot keeping their house clean and neat changes if they are given new things in that home. He follows eight families that were selected to receive home makeovers, assessing their cleanliness before the makeover and after. Given the following confidence interval [-1.26, 095], make a decision about the hypothesis.
35. The formula for the null hypothesis for a paired-samples t test is:
36. Unnithan, Houser, and Fernhall (2006) were interested in whether playing the game DDR affected the heart rate of overweight and nonoverweight adolescents differently. A group of 22 adolescents, 10 classified as overweight and 12 as not overweight, played DDR for 12 minutes, during which time the researches measured each participants heart rate. Which statistical test should the researchers use to analyze their data?
37. The numerator (top portion) of the ratio for calculating all the t statistics contains:
38. When scientists call a hypothesis test conservative, they mean that it is:
39. the formula for the degrees of freedom for the dependent-samples t test is:
40. In a paired-samples test, the comparison distribution of:
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