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 60 residential customers has a mean monthly consumption of 880 kWh. Assume the population standard deviation is 123 kWh. At a = 0.05, can you support the claim? Complete parts (a) through (e). H p# 880 (claim) H, us 880 (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 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<1.64 O B. The rejection region is z>1.64. O C. The rejection regions are z< -1.64 andz>1.64. (c) Find the standardized test statistic. Use technology
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 60 residential customers has a mean monthly consumption of 880 kWh. Assume the population standard deviation is 123 kWh. At a = 0.05, can you support the claim? Complete parts (a) through (e). H p# 880 (claim) H, us 880 (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 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<1.64 O B. The rejection region is z>1.64. O C. The rejection regions are z< -1.64 andz>1.64. (c) Find the standardized test statistic. Use technology
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 860 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 880 kWh. Assume the population standard deviation is 123 kWh. At a = 0.05, can you support the claim? Complete parts (a) through (e).
(a) Identify Ho and Ha. Choose the correct answer below.
O A. Ho: µ= 860 (claim)
O B. H,: µs 880
Ha: µ> 880 (claim)
Ha: p#860
O C. Hρ: μ< 860
Ha: p> 860 (claim)
O D. Ho µ> 860 (claim)
H, µs 860
O E. Ho: µ= 880
O F. Ho: H>880 (claim)
H3: µs 880
Ha: u#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.)
O A. The critical value is
O B. The critical values are +
Transcribed Image Text: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 60 residential customers has a
mean monthly consumption of 880 kWh. Assume the population standard deviation is 123 kWh. At a = 0.05, can you support the claim? Complete parts (a) through (e).
H µ#880 (claim)
H3: us 880
(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 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 <1.64.
O B. The rejection region is z> 1.64.
O C. The rejection regions are z< - 1.64 and z > 1.64.
(c) Find the standardized test statistic. Use technology.
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