Question

A manufacturer claims that the calling range (in feet) of its 900-MHz cordless telephone is greater than that of its leading competitor. A sample of 11 phones from the manufacturer had a mean range of 1240 feet with a standard deviation of 24 feet. A sample of 18 similar phones from its competitor had a mean range of 1230 feet with a standard deviation of 28 feet. Do the results support the manufacturer's claim? Let ?1 be the true mean range of the manufacturer's cordless telephone and ?2 be the true mean range of the competitor's cordless telephone. Use a significance level of ? = 0.01 for the test. Assume that the population variances are equal and that the two populations are normally distributed.

Step 1. State the null and alternative hypotheses for the test.

Step 2. Compute the value of the ? test statistic. Round your answer to three decimal places.

Step 3. Determine the decision rule for rejecting the null hypothesis ?0. Round your answer to three decimal places.

Step 4. State the test's conclusion. A) Reject Null Hypothesis B) Fail to Reject Null Hypothesis

Answer 1