Preston, an official for a state’s department of safety, wants to show that the population mean speed of passenger
vehicles traveling on a certain expressway is greater than the posted speed limit of 65mph. Preston collects a random sample of 59 passenger vehicles traveling on the expressway and finds that the sample mean speed is 67.1mph
with a sample standard deviation of 7.5mph. The test statistic t for a hypothesis test of H0:μ=65 versus Ha:μ65 is t≈2.15
with 58 degrees of freedom. If 0.01p-value0.025 and the level of significance is α=0.10, which of the following statements are accurate for this hypothesis test to evaluate the claim that the true population mean speed of passenger vehicles traveling on the expressway is greater than 65mph?
Statistics and Probability