Intro to stat online hw

    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

    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?

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