Reference no: EM132391465

One study showed that swearing can help reduce ratings of pain. In the study each participant was asked to plunge a hand into icy water and keep it there as long as the pain would allow. In one condition the participants repeated their favorite curse words while their hands were in the water. In the other condition the participants repeated neutral words. In the study they also measured how long the participant could keep their hand in the water. The data are below.

                                          Amount of time (seconds)

Participants      Swear words    Neutral Words

1                                        94                       59

2                                        70                       61'

3                                        52                       47

4                                        83                       60

5                                        46                       35

6                                        117                     92

7                                        69                       53

8                                        39                       30

9                                        51                       56

10                                      73                       61

1. State the null hypothesis.

2. State the alternative hypothesis.

3. What is the critical t two tailed α=.05

4. Calculate the obtained T

SSd=

T=

5. What is the decision?

6. What type of error may you be making?

7. Calculate cohen's D (use SD for swear words)

8. Why is the correlated samples t-test more powerful than the sign test?