Question

Q1. State the null and alternative hypotheses. A customer service center claims the mean time a...

Q1. State the null and alternative hypotheses. A customer service center claims the mean time a customer is "on hold" is less than 2 minutes.

(a) H0: μ = 2 H1: μ < 2

(b) H0: μ < 2 H1: μ = 2

(c) H0: μ = 2 H1: μ > 2

(d) H0: μ > 2 H1: μ = 2

Q2. You are testing the claim that the mean cost of a new car is more than $25,200. How should you interpret a decision that rejects the null hypothesis?

A.There is sufficient evidence to conclude that the mean cost of a new car is more than $25,200.

B.There is not sufficient evidence to conclude that the mean cost of a new car is more than $25,200.

C.There is sufficient evidence to conclude that the mean cost of a new car is $25,200.

Q3. Determine the test statistic zo, the p-value, and the conclusion for the following situation:

H0: p = 0.23 versus  H1: p ≠ 0.23;

n = 200;   x = 52 (use alpha 0.05)

Q4. Suppose we are testing the hypotheses:

H0: μ = 152 versus H1: μ > 152 and we find the P-value to be 0.0125.

At the α = 0.05 level of significance, what would your conclusion be?.

Q5. Suppose we are testing the following hypotheses:

H0: μ = 20 versus  H1: μ > 20

x ¯ = 21.3   s = 3.8   n = 36

Determine the test statistic toand the p-value.  At the α = 0.05 level of significance, what would your conclusion be?

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