In Exercise 8.17 on page 507, we conduct an ANOVA test to see if mean scrotal temperature increase is different between three different conditions. In each condition, males sit with a laptop computer on the lap. In one condition, they sit with legs together, in another with legs apart, and in a third with legs together but a lap pad under the laptop. The ANOVA test found a significant difference in temperature increase between the groups. The summary statistics are shown in Table D.19 and the mean square error from the ANOVA table is 0.63. Conduct tests of all three pairwise comparisons and summarize the findings.

Table D.19

Exercise 8.17 on page 507

Studies have shown that heating the scrotum by just 1^—¦C can reduce sperm count and sperm quality, so men concerned about fertility are cautioned to avoid too much time in the hot tub or sauna. A new study41 suggests that men also keep their laptop computers off their laps. The study measured scrotal temperature in 29 healthy male volunteers as they sat with legs together and a laptop computer on the lap. Temperature increase in the left scrotum over a 60-minute session is given as 2.31 ± 0.96 and a note tells us that €˜€˜Temperatures are given as ^—¦C; values are shown as mean ± SD.€ The abbreviation SD stands for standard deviation. (Men who sit with their legs together without a laptop computer do not show an increase in temperature.)

Transcribed Image Text:

Std.Dev. Mean Condition 0.96 0.69 2.31 2.18 1.41 29 29 29 Legs together Lap pad Legs apart 0.66