Answer Happy

19. A researcher is interested in the effect of amphetamine on water consumption. The researcher had eight rats and randomly chose four rats to inject with amphetamine and injected the remaining four with saline to use as controls. She measured the amount of water consumed by each rat over a period of 24 hours. The results in ml/kg is as follows: Amphetamine (group 1) Control (group 2) 119 124 125 165 168 182 104 157 mean = 129 mean = 157 sd = 27.46 sd = 24.34 Imagine that the researcher suspected that Amphetamines increased water consumption before doing the study. (Check against the data.) Without redoing any calculations, what conclusion would the researcher make this time? The p-value is half of what it was in question 17; we have evidence that there is a difference in water consumption. The p-value is half of what it was in question 17; we do not have evidence that there is a difference in water consumption. O Without finding a p-value, we can say we have no evidence that water consumption increased for the amphetamine group. The test cannot be performed without redoing the calculations. 20. Construct a 95% confidence interval for the difference in means. O-28 + 35.96 0-28 + 42.31 O-28 + 50.93 0-28 + 44.90