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
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Author:Amos Gilat
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Chapter1: Starting With Matlab
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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.)
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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