This is one out of five parts, but I have no idea what the rest are. Any ideas?

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This is one out of five parts, but I have no idea what the rest are. Any ideas? I am so lost!! Thank you in advance!

Previous 11 12 13 14 15 16 18 19 20 Next Question 17 of 25 (1 point) View problem in a pop-uR 9.2 Section Exercise 51 (p-value, table) Facebook: A study showed that two years ago, the mean time spent per visit to Facebook was 20.8 minutes. Assume the standard deviation is ? 8.0 minutes. Suppose that a simple random sample of 107 visits was selected this year and has a sample mean ofr 18.8 minutes. A social scientist is interested to know whether the mean time of Facebook visits has decreased. Use the ?-0.10 level of significance and the critical value method with the table Question Check Answer Solve It Guided Solution Show Example Ask My Instructor Link to Textbook Part 1 out of 5 State the appropriate null and alternate hypotheses. Ho : ? | (select) | H1 : ? (select) : This hypothesis test is a (select) test. Save for Later Submit Assignment

Explanation / Answer

Answer Part 1

Null and alternative hypotheses are as follows:

H0: ? = 20.8
H1: ? < 20.8

This hypothesis test is one-tailed test

Please note:

If one-tailed test is not given in option list you can select left-tailed test.  

Reason it is a one tailed/left tailed test because social scientist want to test whether mean time has decreased or not

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