6) What happens to the shape of the distribution of sample means as sal becomes larger? a) The distribution becomes narrower b) The distribution becomes wider The distribution becomes skewed d) The distribution's shape is unchanged 7) What happens to the shape of the distribution of sample means as standard error becomes OM larger? a) The distribution becomes narrower b) The distribution becomes wider C) The distribution becomes skewed d) The distribution's shape is unchanged 8) Suppose researchers did a study on weight loss in rodents using a diet that restricts food intake. In this study they have a strong justification for the prediction that body weight will only decrease on average if it changes at all. Therefore, if they see any changes, they will only observe weight loss and not weight gain. How should the researchers proceed? a) The researchers should do a one-tailed hypothesis test because it will increase the power of their results ) The researchers should avoid a one-tailed hypothesis test because it will reduce the power of their results c) The researchers should do a two-tailed hypothesis test because it will increase the power of their results d) A one-tailed or two-tailed hypothesis test will yield the same power for the results 9) The researchers in the weight loss study described above concluded that the rat diet significantly reduced weight in the rodents. However, assume that this was a fluke, such that the rat diet does not actually have an effect on weight loss. What can be said about the decision the researchers have made about their study? a) They have made a correct decision because the null hypothesis is actually false b) They have made a type | error c) They have made a type ll error d) They have made a correct decision because the null hypothesis is actually true 10) If a is set to a = .01, what is the probability of rejecting the null hypothesis when it is actually true? a) 0.99 b) 1.00 C) 0.00 d) 0.01