# Question

A highway patrol officer believes that the average speed of cars traveling over a certain stretch of highway exceeds the posted limit of 55 mph. The speeds of a random sample of 200 cars were recorded. Do these data provide sufficient evidence at the 1% significance level to support the officer’s belief? What is the p-value of the test? (Assume that the standard deviation is known to be 5.)

## Answer to relevant Questions

An automotive expert claims that the large number of self-serve gasoline stations has resulted in poor automobile maintenance, and that the average tire pressure is more than 4 pounds per square inch (psi) below its ...In Exercise 11.39, we tested to determine whether the installation of safety equipment was effective in reducing person-hours lost to industrial accidents. The null and alternative hypotheses wereH0: μ = 0H1: μ < 0With σ ...a. A statistics practitioner drew a random sample of 400 observations and found that x̄ = 700 and s = 100. Estimate the population mean with 90% confidence.b. Repeat part (a) with a 95% confidence level.c. Repeat part (a) ...a. A statistics practitioner wishes to test the following hypotheses:H0: µ = 600H1: µ < 600A sample of 50 observations yielded the statistics x̄ = 85 and s = 45. Calculate the test statistic of a test to determine whether ...a. Test the following hypotheses with α = .05 given that x̄ = 405, s = 100, and n = 1,000.H0: µ = 400H1: µ > 400b. Repeat part (a) assuming that you know that the population standard deviation is σ = 100.c. Explain why ...Post your question

0