A company claims that the mean monthly residential electricity consumption in a certain region is more than 870 kiloWatt-hours (kWh). You want to test this claim. You find that a random sample of 61 residential customers has a mean monthly consumption of 890 kWh. Assume the population standard deviation is 129 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>870 (claim) Ha: μ≤870 B. H0: μ=890 Ha: μ≠890 (claim) C. H0: μ>890 (claim) Ha: μ≤890 D. H0: μ≤870 Ha: μ>870 (claim) Your answer is correct. E. H0: μ≤890 Ha: μ>890 (claim) F. H0: μ=870 (claim) Ha: μ≠870 (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 2.332.33. Your answer is correct. B. The critical values are ±enter your response here. Identify the rejection region(s). Select the correct choice below. A. The rejection regions are z<−2.33 and z>2.33. B. The rejection region is z<2.33. C. The rejection region is z>2.33.
A company claims that the mean monthly residential electricity consumption in a certain region is more than 870 kiloWatt-hours (kWh). You want to test this claim. You find that a random sample of 61 residential customers has a mean monthly consumption of 890 kWh. Assume the population standard deviation is 129 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>870 (claim) Ha: μ≤870 B. H0: μ=890 Ha: μ≠890 (claim) C. H0: μ>890 (claim) Ha: μ≤890 D. H0: μ≤870 Ha: μ>870 (claim) Your answer is correct. E. H0: μ≤890 Ha: μ>890 (claim) F. H0: μ=870 (claim) Ha: μ≠870 (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 2.332.33. Your answer is correct. B. The critical values are ±enter your response here. Identify the rejection region(s). Select the correct choice below. A. The rejection regions are z<−2.33 and z>2.33. B. The rejection region is z<2.33. C. The rejection region is z>2.33.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
A company claims that the mean monthly residential electricity consumption in a certain region is more than
870
kiloWatt-hours (kWh). You want to test this claim. You find that a random sample of
61
residential customers has a mean monthly consumption of
890
kWh. Assume the population standard deviation is
129
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.H0:
μ>870
(claim)Ha:
μ≤870
H0:
μ=890
Ha:
μ≠890
(claim)H0:
μ>890
(claim)Ha:
μ≤890
H0:
μ≤870
Ha:
μ>870
(claim)H0:
μ≤890
Ha:
μ>890
(claim)H0:
μ=870
(claim)Ha:
μ≠870
(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
2.332.33.
The critical values are
±enter your response here.
Identify the rejection region(s). Select the correct choice below.
The rejection regions are
z<−2.33
and
z>2.33.
The rejection region is
z<2.33.
The rejection region is
z>2.33.
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