Intro to stat online hw
Hello, I have an online hwÂ I would like help in. It is about intro to statistics. it is multiple choice, 30 questions
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 ofÂ z?
Can anyone help me as soon as possible?