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Mathematics, 13.12.2019 21:31, Teedollasign
In 2017, the average credit score for loans that were purchased by a government-sponsored mortgage loan company was 744. a random sample of 35 mortgages recently purchased by the company was selected, and it was found that the average credit score was 753 with a sample standard deviation of 19. complete parts a through c.
a. using a = 0.05, is there enough evidence from this sample to conclude that the average credit score for mortgages purchased by the company has increased since 2017?
determine the null and alternative hypotheses. hos 744 h: > 744 (type integers or decimals. do not round.) determine the appropriate critical value. select the correct choice below and fill in the answer box within your choice. (round to three decimal places as needed.)
a. -ta=
b. tą = 1.691
c. ta/2=
b. determine the precise p-value for this test using excel. the p-value is 0.004
the p-value is 0.004 (round to three decimal places as needed.)
c. what assumptions need to be made to perform this analysis? select all that apply.
a. the population is normally distributed.
b. the sample mean is large.
c. no assumptions are necessary.
d. the sample is large.
e. the population standard deviation is small.
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