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) H*_{0}: μ = 2 *H*_{1}: μ <
2

*(b) H*_{0}: μ < 2 *H*_{1}: μ =
2

*(c) H*_{0}: μ = 2 *H*_{1}: μ >
2

*(d) H*_{0}: μ > 2 *H*_{1}: 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:

*H*_{0}: *p* = 0.23
versus *H*_{1}: *p* ≠ 0.23;

*n* = 200; *x* = 52 (use alpha
0.05)

Q4. Suppose we are testing the hypotheses:

*H*_{0}: μ = 152 versus *H*_{1}: 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:

*H*_{0}: μ = 20
versus *H*_{1}: μ > 20

x ¯ = 21.3 *s* =
3.8 *n* = 36

Determine the test statistic t* _{o}*and the
p-value. At the α = 0.05 level of significance, what
would your conclusion be?

Answer #1

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