Use the following scenario to address questions 1-7. Scientists studying a particular species of endangered primate are concerned that the health of the primates is in danger due to habitat loss and malnutrition. Even the slightest decrease in average body weight is of great concern. Last Spring, each of the remaining members of the species were examined, and general information was recorded such as weight. It was found that the primate weights approximated a normal distribution. We randomly select a single sample member from the population and use its weight to represent the research population.

1. Assume our question of interest is: has there been a significant decrease in primate weights since the last examination period (last Spring)? What type of test should be conducted? a) one-tailed hypothesis test, rejection region at low tail b) one-tailed hypothesis test, rejection region at high tail c) one-tailed hypothesis test, directionality unknown d) two-tailed hypothesis test

2. Which of the following is the research hypothesis for the procedure you chose in question 1? a)M general = M research

b)M general does NOT =M research

c) M general < M research

d)M general < M research

3. The average weight of the population was originally recorded last Spring as being 200 pounds with a standard deviation of 16. The weight of our current sample primate is 245 pounds. Using the .05 level of significance (5%), what is the correct outcome to the procedure you selected in question 1? a) Reject the null hypothesis, results indicate primate weight has decreased since last Spring b) Reject the null hypothesis, results indicate primate weight has increased since last Spring c) Reject the null hypothesis, results indicate primate weight has changed in some unknown way d) Fail to reject the null hypothesis, insufficient evidence to suggest a treatment effect e) Fail to reject the null hypothesis, we have proven the null hypothesis to be true

4. Now suppose the research question we are addressing is the following: has the weight of these primates changed in some way? In other words, is there a difference? What type of hypothesis test should be conducted? a) one-tailed hypothesis test, rejection region at low tail b) one-tailed hypothesis test, rejection region at high tail c) one-tailed hypothesis test, directionality unknown d) two-tailed hypothesis test

5. Which of the following is the research hypothesis for the procedure you chose in question 4? a)M general = M research

b)M general does NOT =M research

c) M general < M research

d)M general < M research

6.)member, the average weight of the population was originally recorded last Spring as being 200 pounds with a standard deviation of 16. The weight of our current sample primate is 245 pounds. Using the .01 level of significance (1%), what is the correct outcome to the procedure you selected in question 4? a) Reject the null hypothesis, results indicate primate weight has decreased b) Reject the null hypothesis, results indicate primate weight has increased c) Reject the null hypothesis, results indicate primate weight has changed in some unknown way d) Fail to reject the null hypothesis, insufficient evidence to suggest a treatment effect e) Fail to reject the null hypothesis, we have proven the null hypothesis to be true

7. Which of the following is closest to the z score that you observed for your sample primate? a) -3 c) 0 e) 3 b) -1.5 d) 1.5