res in PSPP and assigning your experimental group and control group! 1. What is the control group mean? 2. Should you reject the null hypothesis?
In an experiment, 10 participants were given a test of mental performance in stressful situations. Their scores were 2, 2, 4, 1, 4, 3, 0, 2, 7, and 5. Ten other participants were given the same test after they had been trained in stress-reducing techniques. Their scores were 4, 4, 6, 0, 6, 5, 2, 3, 6, and 4. Do the appropriate t-test to determine if the group that had been trained had different mental performance scores than the group that had not been trained in stress reduction techniques. What do these results
Hint: Begin by entering all of the scores in PSPP and assigning your experimental group and control group!
1. What is the control group mean?
2. Should you reject the null hypothesis?
yes
we do not have enough information to make this decision without follow-up analysis
no
3. Which of the following variables is interval/ratio?
the participant's gender
whether or not a participant had the stress-reduction training
the score on the test of mental performance
the participant's assignment to the experimental group or control group
what types of circumstances the participant considers "stressful"
4. Which type of t-test would you need for this analysis?
paired samples t-test/t-test for dependent means
one-sample t-test
controlled ratio t-test
z-test to t-test conversion
t-test for independent means/independent samples t-test
5. What is the experimental group mean?
6. What is the control group standard deviation? (report to 2 decimal places, so x.xx)
7. Were these results statistically significant?
The analysis was inconclusive
This is a trick question: this type of t-test does not evaluate results in terms of statistical significance
No
Yes
8. What was the t score? Make sure you give any sign indicators necessary and report to 2 decimal places (so, x.xx or -x.xx).
9. What is the experimental group standard deviation? (report to 2 decimal places, so x.xx)
10. What is the significance value? Report to 3 decimal places (so .xxx)
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