Question

Some people claim that women can experience “mother hearing,” an increased sensitivity to and awareness of noises made by children. A researcher recruits women, both mothers and non-mothers, to come to a purported “sleep experiment” in which they are led to believe that they will be evaluating the comfort of different mattresses. While each woman is asleep, a child’s voice is played and level of volume needed to wake the woman is recorded. Based upon the data from the 14 participants, do mothers wake at a different average sound volume (in decibels) than non-mothers? Use a two-tailed test with alpha = .05

(Carefully copy the following data to a sheet of paper in order to do your calculations.)

1. calculate the sum of squares for non-mothers

2. Calculate the sum of squares for mothers

3. Calculate the variance for non-mothers

4. calculate the variance for mothers

5. Calculate the standard error (round to 4 decimal places)

6. Calculate the t ratio

7. enter degrees of freedom

8. Enter the tabled value of t critical (t_crit). (Enter a positive value.)

9. Reject or do not reject the null hypothesis

10. calculate cohen's d

11. Complete the APA formatted statistic. (Round the t-ratio and Cohen's d to 2 decimal places and leave df as an integer. This is how they typically appear in print.)

Non-Mothers	Mothers
48	48
41	55
56	51
54	34
51	37
39	43
61	40

Answer 1