, 08.11.2019 02:31 bumeh511

# Arandom sample of size n = 10 is taken from a large population. let µ be the unknown population mean. a test is planned of h0 : µ = 12 vs. ha : µ 6= 12 using α = 0.1. a qq plot indicates it it is reasonable to assume a normal population. from the sample, ¯x = 14.2 and s = 4.88. (i suggest doing this problem with a calculator and table as practice for exams. you may check your answers with r if you wish.) (a) since the data leave it plausible that the population is normal, and the population standard deviation σ is unknown, a t-test is appropriate. compute the p-value of the test. do you reject or not reject h0? (b) compute the power of the test if the true population mean is µa = 15. (c) using s = 4.88 as our best guess of σ, approximately what sample size would be required to achieve a power of 0.8 if the true population mean is µa = 15? give your answer as the smallest whole number that meets the criterion.

### Another question on Mathematics

Mathematics, 20.06.2019 18:02
This question consists of 2 parts, a and b. marco got a quotient of 70 when he divided 49 by 0.07. part a what is the correct answer to this problem? part b what mistake did marco make? you!