Question

A study explored the effect of ethanol on sleep time. Fifteen rats were randomized to one of three treatments. Treatment 1 was water (control). Treatment 2 was 1g of ethanol per kg of body weight, and Treatment 3 was 2g/kg. The amount of REM sleep (in minutes) in a 24hr period was recorded:

Treatment 1	63	54	69	50	72
Treatment 2	45	60	40	56
Treatment 3	31	40	45	25	23	28

Are these data strong evidence REM sleep time differs across the three treatment populations?

Use R to create 95% CIs for all pairwise comparisons of means using the Tukey-Kramer method. Give the r code that gives the 95% CIs. Summarize your results using letter codes. What do you conclude?

Answer 1

Given that,

Q ) Level N mst Dev l Sea The vaiam within the

2 99 ·9826) msp.S5C-997.9826) -83.16522. N-K Is-3 The Rairuwise. compaxisay -f means vsing te Tukey method S The 95% Confidoce interval between MI4MZb si mificet 264195