Question

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 z_o, 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 t_oand the p-value.  At the α = 0.05 level of significance, what would your conclusion be?

Answer 1

ANSWER:

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