Use only z or t value

1. (a) (4 points) Write the null and alternate hypothesis if the claim is that the mean weight is greater than 68. (b) (4 points) Write the decision rule for the above case at 2.5% level of significance using z. (c) (4 points) Using the information in parts (a) and (b) given above, what is your conclusion if the sample statistic (Zs) was found to be 3.25? 2. The average weight of an item is supposed to be at least 65. To test this at 1% level of significance, a sample of 15 items was taken. The population standard deviation of weight is not known. (a) (4 points) Write the null and alternate hypotheses. (b) (4 points) Write the decision rule