A company claims that the mean monthly residential electricity consumption in a certain region is more than 860 kiloWatt-hours (kWh). You want to test this claim. You find that a random sample of 63 residential customers has a mean monthly consumption of 880 kWh. Assume the population standard deviation is 120 kWh. At α=0.01, can you support the claim? Complete parts (a) through (e). (a) Identify H0 and Ha. Choose the correct answer below. A. H0: μ>880 (claim) Ha: μ≤880 B. H0: μ>860 (claim) Ha: μ≤860 C. H0: μ=860 (claim) Ha: μ≠860 D. H0: μ≤860 Ha: μ>860 (claim) E. H0: μ≤880 Ha: μ>880 (claim) F. H0: μ=880 Ha: μ≠880 (claim) (b) Find the critical value(s) and identify the rejection region(s). Select the correct choice below and fill in the answer box within your choice. Use technology. (Round to two decimal places as needed.) A. The critical value is nothing. B. The critical values are ±nothing. Identify the rejection region(s). Select the correct choice below. A. The rejection region is z<2.33. B. The rejection regions are z<−2.33 and z>2.33. C. The rejection region is z>2.33. (c) Find the standardized test statistic. Use technology. The standardized test statistic is z=nothing. (Round to two decimal places as needed.) (d) Decide whether to reject or fail to reject the null hypothesis. A. Fail to reject H0 because the standardized test statistic is not in the rejection region. B. Reject H0 because the standardized test statistic is not in the rejection region. C. Fail to reject H0 because the standardized test statistic is in the rejection region. D. Reject H0 because the standardized test statistic is in the rejection region. (e) Interpret the decision in the context of the original claim. At the 1% significance level, there ▼ is notis not isis enough evidence to ▼ reject support the claim that the mean monthly residential electricity consumption in a certain region ▼ is different from is greater than is less than nothing kWh. Click to select your answer(s).

A company claims that the mean monthly residential electricity consumption in a certain region is more than 860 kiloWatt-hours (kWh). You want to test this claim. You find that a random sample of 63 residential customers has a mean monthly consumption of 880 kWh. Assume the population standard deviation is 120 kWh. At α=0.01, can you support the claim? Complete parts (a) through (e). (a) Identify H0 and Ha. Choose the correct answer below. A. H0: μ>880 (claim) Ha: μ≤880 B. H0: μ>860 (claim) Ha: μ≤860 C. H0: μ=860 (claim) Ha: μ≠860 D. H0: μ≤860 Ha: μ>860 (claim) E. H0: μ≤880 Ha: μ>880 (claim) F. H0: μ=880 Ha: μ≠880 (claim) (b) Find the critical value(s) and identify the rejection region(s). Select the correct choice below and fill in the answer box within your choice. Use technology. (Round to two decimal places as needed.) A. The critical value is nothing. B. The critical values are ±nothing. Identify the rejection region(s). Select the correct choice below. A. The rejection region is z<2.33. B. The rejection regions are z<−2.33 and z>2.33. C. The rejection region is z>2.33. (c) Find the standardized test statistic. Use technology. The standardized test statistic is z=nothing. (Round to two decimal places as needed.) (d) Decide whether to reject or fail to reject the null hypothesis. A. Fail to reject H0 because the standardized test statistic is not in the rejection region. B. Reject H0 because the standardized test statistic is not in the rejection region. C. Fail to reject H0 because the standardized test statistic is in the rejection region. D. Reject H0 because the standardized test statistic is in the rejection region. (e) Interpret the decision in the context of the original claim. At the 1% significance level, there ▼ is notis not isis enough evidence to ▼ reject support the claim that the mean monthly residential electricity consumption in a certain region ▼ is different from is greater than is less than nothing kWh. Click to select your answer(s).

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

A company claims that the mean monthly residential electricity consumption in a certain region is more than

860

kiloWatt-hours (kWh). You want to test this claim. You find that a random sample of

residential customers has a mean monthly consumption of

880

kWh. Assume the population standard deviation is

120

kWh. At

α=0.01,

can you support the claim? Complete parts (a) through (e).

(a) Identify

and

Ha.

Choose the correct answer below.

H0:

μ>880

(claim)

Ha:

μ≤880

H0:

μ>860

(claim)

Ha:

μ≤860

H0:

μ=860

(claim)

Ha:

μ≠860

H0:

μ≤860

Ha:

μ>860

(claim)

H0:

μ≤880

Ha:

μ>880

(claim)

H0:

μ=880

Ha:

μ≠880

(claim)

(b) Find the critical value(s) and identify the rejection region(s). Select the correct choice below and fill in the answer box within your choice. Use technology.

(Round to two decimal places as needed.)

The critical value is

nothing.

The critical values are

±nothing.

Identify the rejection region(s). Select the correct choice below.

The rejection region is

z<2.33.

The rejection regions are

z<−2.33

and

z>2.33.

The rejection region is

z>2.33.

The standardized test statistic is

z=nothing.

(Round to two decimal places as needed.)

(d) Decide whether to reject or fail to reject the null hypothesis.

Fail to reject

because the standardized test statistic

is not

in the rejection region.

Reject

because the standardized test statistic

is not

in the rejection region.

Fail to reject

because the standardized test statistic

in the rejection region.

Reject

because the standardized test statistic

in the rejection region.

(e) Interpret the decision in the context of the original claim.

At the

significance level, there

▼

is notis not

isis

enough evidence to

▼

reject

support

the claim that the mean monthly residential electricity consumption in a certain region

▼

is different from

is greater than

is less than

nothing

kWh.

Click to select your answer(s).

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