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 67 residential customers has a mean monthly consumption of 900 kWh. Assume the population standard deviation is 130 kWh. At a=0.01, can you support the daim? Complete parts (a) through (e).

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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 67 residential customers has a mean monthly
consumption of 900 KWh. Assume the population standard deviation is 130 kWh. At a0.01, can you support the dlaim? Complete parts (a) through (e)
(a) Identify Ho and H Choose the correct answer below.
OB. H: u= 900
H u 900 (claim)
O A. Ho: u> 900 (daim)
H us900
OC. Hoi us900
Hiu> 900 (dlaim)
OD. H:= 880 (claim)
Hu 880
OE. H uS 880
Hu> 880 (claim)
OF. Hai> 880 (claim)
Hus 880
(b) Find the critical value(s) and identify the rejection region(s). Select the correct choice below and fil in the answer box within your choice. Use technology.
(Round to two decimal places as needed.)
O A. The critical values are
O B. The critical value is.
Identity the rejection region(s). Select the correct choice below.
O A. The rejection regions are z<-2.33 and z>2.33.
OB. The rejection region is z<2.33.
OC. The rejection region is z>2.33.
(c) Find the standardized test statistic. Use technology.
The standardized test statistic is z=
(Round to two decimal places as needed.)
Click to select your answer(s).
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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 67 residential customers has a mean monthly consumption of 900 KWh. Assume the population standard deviation is 130 kWh. At a0.01, can you support the dlaim? Complete parts (a) through (e) (a) Identify Ho and H Choose the correct answer below. OB. H: u= 900 H u 900 (claim) O A. Ho: u> 900 (daim) H us900 OC. Hoi us900 Hiu> 900 (dlaim) OD. H:= 880 (claim) Hu 880 OE. H uS 880 Hu> 880 (claim) OF. Hai> 880 (claim) Hus 880 (b) Find the critical value(s) and identify the rejection region(s). Select the correct choice below and fil in the answer box within your choice. Use technology. (Round to two decimal places as needed.) O A. The critical values are O B. The critical value is. Identity the rejection region(s). Select the correct choice below. O A. The rejection regions are z<-2.33 and z>2.33. OB. The rejection region is z<2.33. OC. The rejection region is z>2.33. (c) Find the standardized test statistic. Use technology. The standardized test statistic is z= (Round to two decimal places as needed.) Click to select your answer(s). MacBook Air 80 888 esc F10 + 23 $ & 1 3 4 6 7 8 delete Q E R Y U tab A G H J K L return caps lock > C V M sh -hift command option control option command
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