# Question 1 5 out of 5 points twenty college students

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Question 1 5 out of 5 points Twenty college students experience the effects of alcohol on reaction time. They perform very basic timed responses in a driving simulator both before and after
consuming several alcoholic beverages. The researcher collects a reaction time result for each of the 20 students before and after intoxication, for a total of 40 measures. What are the degrees of freedom for this study?
Question 2 5 out of 5 points What is the paired-samples t test statistic for the following difference scores: –2, – 19, +17, –22, –6?
15.57 Question 3 5 out of 5 points A clinical researcher was interested in determining whether her interventions were effective in minimizing depression symptoms among participants. To assess the effectiveness of the treatment program, she administered a depression inventory prior to treatment and after treatment. She hypothesized that depression scores would be lower at time 2 compared to time 1. She then compared the mean differences between the two groups and found that the treatment was effective. The independent variable in this study is: Question 4
5 out of 5 points Which of these is NOT an assumption of the paired-samples t test? Selected Answer: There are more than 30 sample data. Answers: The dependent variable is a scale variable. Participants are randomly selected. There are more than 30 sample data.
The population is normally distributed. Question 5 5 out of 5 points A clinical researcher was interested in determining whether her interventions were effective in minimizing depression symptoms among participants. To assess the effectiveness of the treatment program, she administered a depression inventory prior to treatment and after treatment. She hypothesized that depression scores would be lower at time 2 compared to time 1. She then compared the mean differences between the two groups and found that the treatment was effective. The dependent variable in this study is:
Question 6 5 out of 5 points As the sample size becomes larger, the t distributions become:
Question 7 5 out of 5 points What would be the decision for a two-tailed paired-samples t test where the t statistic is –2.67, with cutoffs of ±2.776?
Question 8 5 out of 5 points A researcher collects 15 data points that yield a mean of 9.164 and a standard deviation (based on N – 1) of 2.377. If the researcher is comparing the sample to a population mean of 10.6, what is the value of the test statistic? Selected Answer: –2.339 Answers:
0.611 –0.604 –1.943 –2.339 Question 9 5 out of 5 points