A psychologist wants to determine the effect of instructions on the time required to solve a mechanical puzzle. Each of 20 volunteers is given the same mechanical puzzle to be solved as rapidly as possible. Before the task, the subjects are randomly assigned in equal numbers to receive two different sets of instructions. One group is told that the task is difficult, the other group is told the task is easy. The score for each subject reflects the time in minutes required to solve the puzzle. Test the research using a two-tailed test and α = .05. Difficult instruction. Easy instruction 5. 13 20. 6 7. 6 23. 5 30. 3 24. 6 9. 10 8. 20 20. 9 12. 12 State the null hypothesis and the critical value of t . Provide a table of descriptive statistics. Provide the obtained value of the t-test.
A psychologist wants to determine the effect of instructions on the time required to solve a mechanical puzzle. Each of 20 volunteers is given the same mechanical puzzle to be solved as rapidly as possible. Before the task, the subjects are randomly assigned in equal numbers to receive two different sets of instructions. One group is told that the task is difficult, the other group is told the task is easy. The score for each subject reflects the time in minutes required to solve the puzzle. Test the research using a two-tailed test and α = .05.
Difficult instruction. Easy instruction
5. 13
20. 6
7. 6
23. 5
30. 3
24. 6
9. 10
8. 20
20. 9
12. 12
State the null hypothesis and the critical value of t .
Provide a table of
Provide the obtained value of the t-test.
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