Question

Need step 3 only.

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 15 phones from the manufacturer had a mean range of 1280 feet with a standard deviation of 21 feet. A sample of 10 similar phones from its competitor had a mean range of 1230 feet with a standard deviation of 40 feet. Do the results support the manufacturer's claim? Let , be the true mean range of the manufacturer's cordless telephone and Hy be the true mean range of the competitor's cordless telephone. Use a significance level of a = 0.01 for the test. Assume that the population variances are equal and that the two populations are normally distributed Step 1 of 4: State the null and alternative hypotheses for the test. Answer 2 Points Tables Keypad HOM= h Haimi> the Next

Answer 1

Answer: Step 3: - Test statistic ander Ho to I t= m tnta 2 01-22 spLIU ni nz - tcritical = tnith- 2 2 I Here ni=15 D 2=10 a=0.01 tnth-2, sample size sample size Clevel) tis10 -2 20.01 - t230.0L = 2.500 (3 decimal) from statistical table Answer: Reject Ho if t > L 2.500