A regulation golf ball should weigh 45 grams. A company produces golf balls for the PGA. To help ensure a high degree of accuracy, a random sample of 23 golf balls is drawn from the production line every 75 minutes and each golf ball is measured for accuracy. If the average weight of the sample is found to be significantly different than 45 grams, then the production line is shut down for inspection. The mean weight of a recent sample of 23 golf balls was found to be 47.4 grams. Use the p-value method to test the hypothesis that the mean weight of a golf ball produced by this company is different than 45 grams, using a = 0.005. Assume that the distribution of weights of all golf balls produced by this company is known to be approximately normally distributed with a standard deviation of 8.9 grams. State the null and alternative hypothesis for this test. Ho:? V H₁: ? ✓ Determine if this test is left-tailed, right-tailed, or two-tailed. Oleft-tailed O two-tailed Oright-tailed Should the standard normal (2) distribution or Student's (t) distribution be used for this test? The Student's t distribution should be used O The standard normal (2) distribution should be used Determine the test statistic for the hypothesis test. Round the solution to two decimal places. Determine the p-value for the hypothesis test. Round the solution to four decimal places.

Let's use SPSS to run a one-sample t-test!  Imagine that you are interested in whether the number of hours students in a statistics course work each week differs from the average number of hours reported by the general student body at ASU.  Thankfully, you have a data set that consists of information from students in a statistics course, including how many hours they work each week ("workhours").  You also happen to know that the average number of hours worked each week by the general student population at ASU is 25.  Use the data provided to conduct a one sample t-test in SPSS comparing the sample data to the population mean..  The dependent variable for your test should be "workhours".   Based on your output, the average number of hours worked each week by a sample is ________ .  Enter your answer rounded to two decimal places (i.e., 10.01, not 10.1, not 10.0, not 10.010).

The results of a common standardized test used in psychology research is designed so that the population mean is 105 and the standard devlation is 30. A subject earns a score of 108. What is the Z-score for this raw score? Z-Score =

The first blank for both questions is: "estimate of the standard ('distance' or 'score' or 'mean')" Second blanks: "...between a ('sample mean' or 'sample mean difference' or 'score')"  Third Blanks: "...and the ('population mean difference' or 'population mean' or sample mean')" The choices are the same for the corresponding blanks, first, second and third.