(c) Find the standardized test statisuc. Use technology. The standardized test statistic is z=. (Round to two decimal places as needed.)

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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 880 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 920 kWh. Assume the population standard deviation is 129 kWh. At a = 0.01, can you support the claim? Complete parts (a) through (e).
(a) Identify Ho and H.. Choose the correct answer below.
O A. Ho: u= 880 (claim)
ΥΒ. H: μs 880
H:u#880
Ha:u> 880 (claim)
O C. Ho: u> 920 (claim)
Ο D. Hλ: μ5 920
H: us 920
Ha:u>920 (claim)
O E. Ho: u> 880 (claim)
H:us 880
OF. Ho: H=920
Ha:u#920 (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.)
O A. The critical values are +
B. The critical value is 2.33
Identify the rejection region(s). Select the correct choice below.
O A. The rejection region isz<2.33.
YB. The rejection region is z> 2.33.
O C. The rejection regions are z< -2.33 and z>2.33
(c) Find the standardized test statisuc. 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 880 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 920 kWh. Assume the population standard deviation is 129 kWh. At a = 0.01, can you support the claim? Complete parts (a) through (e). (a) Identify Ho and H.. Choose the correct answer below. O A. Ho: u= 880 (claim) ΥΒ. H: μs 880 H:u#880 Ha:u> 880 (claim) O C. Ho: u> 920 (claim) Ο D. Hλ: μ5 920 H: us 920 Ha:u>920 (claim) O E. Ho: u> 880 (claim) H:us 880 OF. Ho: H=920 Ha:u#920 (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.) O A. The critical values are + B. The critical value is 2.33 Identify the rejection region(s). Select the correct choice below. O A. The rejection region isz<2.33. YB. The rejection region is z> 2.33. O C. The rejection regions are z< -2.33 and z>2.33 (c) Find the standardized test statisuc. Use technology. The standardized test statistic is z =. (Round to two decimal places as needed.)
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