Question 10: I invested the same amount, $100 in each of 50 stock picks. The average amount I made was $110, and the standard deviation of the amount I made was 45. Test the null hypothesis that I have no skill: i.e., the population mean of the amount I made back was $100. Make sure to state your conclusion about whether I have skill or not.

You are a consumer psychologist interested in holiday spending. A national census reports that the American family spent an average of u = $81 for Halloween candy and costumes last year. A sample of N = 16 families this year produced a mean of $85 with s = 20. Using at-test single sample, what is your df?

Given that x = 35, n = 52, and o = 4, then we can be 95% confident that the true mean,u, lies between the values and

Suppose you are a researcher in a hospital. You are experimenting with a new tranquilizer. You collect data from a random sample of 8 patients. The period of effectiveness of the tranquilizer for each patient (in hours) is as follows: 2.3 2.1 2.5 2.8 21 2.5 2.8

Write the null and hypothesis for this test.

C. Atlantic Video is planning to add the new Marvel movie to their collection, and they predict that this will double their demand (i.e. new arrival rate is 60 customers every hour) and halve the standard deviation of the inter-arrival times. However, they want to keep the average waiting time of customers in line the same as before. Assume that the coefficient of variation for the check-out times does not change. Please answer the following questions.     1) Does the employee need to work twice as fast? If not, calculate the new service rate. 2) What is the average number of customers in the store?