Question

1. For the standardized test statistic approach to hypothesis testing, calculate the test statistic for testing the null hypothesis that the population mean is less than or equal to 9.94, given a sample mean of 15.20, a sample size of 49, and a population standard deviation of 3.25. Round to two decimals.

2. The manager of a paint supply store wants to determine if the mean amount of paint contained in 1- gallon cans purchased from a nationally known manufacturer is actually more than 1-gallon. It is known that for this manufacturer the population standard deviation of the amount of paint is equal to 0.02 gallons. A random sample of 98.0 cans is selected, and the mean amount of paint per 1-gallon can is 1.00 gallons. Use a significance level of 0.1. Is (are) the critical region(s) for this test in the left tail, right tail, or both tail(s)?   Please answer with one of the following words: left, right, both.

Answer 1