Intro to stat online hw
Hello, I have an online hw I would like help in. It is about intro to statistics. it is multiple choice, 30 questions
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Sample questionÂ
Assume that the null hypothesis is that the population mean is equal to 80 and the alternative hypothesis is that the population mean is less than 80. A random sample of 99 elements selected from the population produced a mean of 75.3. Assume that the population standard deviation is 24.6, and that the test is to be made at the 5% significance level. What is the critical value of z?
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Can anyone help me as soon as possible?