A random sample of 80 eighth grade students' scores on a national mathematics assessment test has a mean score of 286. This test result prompts a state school administrator to declare that the mean score for the state's eighth graders on this exam is more than 280. Assume that the population standard deviation is 30. At a=0.11, is there enough evidence to support the administrator's claim? Complete parts (a) through (e). CIT z (a) Write the claim mathematically and identify Ho and H. Choose the correct answer below. OA. Ho: 280 OB. Ho: 280 (claim) H₂H>280 OC. Ho: H5280 (claim) H>280 Ha H>280 (claim) OD. Ho: 2280 (claim) VE. Ho: $280 QF. Ho<280 H₂H 280 H>280 (claim) H:2280 (claim) 21 (b) Find the standardized test statistic z, and its corresponding area. NS Z= (Round to two decimal places as needed.) MI (b) Find the standardized test statistic z, and its corresponding area. The standardized test statistic is

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A random sample of 80 eighth grade students' scores on a national mathematics assessment test has a mean score of 286. This test result prompts a state school
administrator to declare that the mean score for the state's eighth graders on this exam is more than 280. Assume that the population standard deviation is 30. At
a=0.11, is there enough evidence to support the administrator's claim? Complete parts (a) through (e).
GILE
z (a) Write the claim mathematically and identify Ho and H. Choose the correct answer below.
OA. Ho: 280
OB. Ho: 280 (claim)
H₂H>280
OC. Ho: HS280 (claim)
H₂H>280
Ha 280 (claim)
VE. Ho: 5280
QF. Ho <280
OD. Ho: 2280 (claim)
H₂H<280
H>280 (claim)
H:2280 (claim)
21
(b) Find the standardized test statistic z, and its corresponding area.
NS
Z= (Round to two decimal places as needed.)
MI
(b) Find the standardized test statistic z, and its corresponding area.
The standardized test statistic is
Transcribed Image Text:A random sample of 80 eighth grade students' scores on a national mathematics assessment test has a mean score of 286. This test result prompts a state school administrator to declare that the mean score for the state's eighth graders on this exam is more than 280. Assume that the population standard deviation is 30. At a=0.11, is there enough evidence to support the administrator's claim? Complete parts (a) through (e). GILE z (a) Write the claim mathematically and identify Ho and H. Choose the correct answer below. OA. Ho: 280 OB. Ho: 280 (claim) H₂H>280 OC. Ho: HS280 (claim) H₂H>280 Ha 280 (claim) VE. Ho: 5280 QF. Ho <280 OD. Ho: 2280 (claim) H₂H<280 H>280 (claim) H:2280 (claim) 21 (b) Find the standardized test statistic z, and its corresponding area. NS Z= (Round to two decimal places as needed.) MI (b) Find the standardized test statistic z, and its corresponding area. The standardized test statistic is
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