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 60 residential customers has a mean monthly consumption of 910 kWh. Assume the population standard deviation is 123 kWh. At a=0.10, can you support the claim? Complete parts (a) through (e). (a) Identify Ho and H Choose the correct answer below. OA. Ho: >870 (claim) O B. Ho >910 (claim) Hus910 Hus870 OC. Ho: =87o (claim) H u#870 OD. Ho S91o H>910 (claim) OF. Ho: us870 Hp>870 (claim) OE Ho: =910 Hp#910 (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.) OA The critical value is O B. The critical values are . Identify the rejection region(s). Select the correct choice below. O A The rejection region is z<1.28. O B. The rejection regions are z< -1.28 and z>1.28. OC. The rejection region is z>1.28. (c) Find the standardized test statistic. Use technology The standardized test statistic is z= (Round to two decimal places as needed.)
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 60 residential customers has a mean monthly consumption of 910 kWh. Assume the population standard deviation is 123 kWh. At a=0.10, can you support the claim? Complete parts (a) through (e). (a) Identify Ho and H Choose the correct answer below. OA. Ho: >870 (claim) O B. Ho >910 (claim) Hus910 Hus870 OC. Ho: =87o (claim) H u#870 OD. Ho S91o H>910 (claim) OF. Ho: us870 Hp>870 (claim) OE Ho: =910 Hp#910 (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.) OA The critical value is O B. The critical values are . Identify the rejection region(s). Select the correct choice below. O A The rejection region is z<1.28. O B. The rejection regions are z< -1.28 and z>1.28. OC. The rejection region is z>1.28. (c) Find the standardized test statistic. Use technology The standardized test statistic is z= (Round to two decimal places as needed.)
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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Transcribed Image Text: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 60 residential customers has a mean monthly consumption of 910 kWh. Assume the population standard deviation is 123 kWh.
At a= 0.10, can you support the claim? Complete parts (a) through (0).
(a) Identify Ho and H Choose the correct answer below.
O A. Ho: >870 (claim)
Hus870
O B. Ho: >910 (claim)
Hus910
OC. Ho: =870 (claim)
H#870
OD. Ho S91o
H>910 (claim)
OE Ho: u=910
Hu#910 (claim)
OF. Ho: us870
Hp>870 (claim)
(b) Find the critical value(s) and identify the rejection region(s). Select the correct choice
and fil in the answer box within your choice. Use technology.
(Round to two decimal places as needed.)
OA The critical value is.
O B. The critical values are .
Identify the rejection region(s). Select the correct choice below.
OA The rejection region is z<1.28.
O B. The rejection regions are z< -1.28 and z>1.28.
OC. The rejection region is z>1.28.
(c) Find the standardized test statistic. Use technology
The standardized test statistic is z=
(Round to two decimal places as needed.)
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