Facebook: A study showed that two years ago, the mean time spent per visit to Facebook was 20.2 minutes. Assume the standard deviation is a UU minutes. Suppose that a simple random sample of 103...

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Questions 1

1-  2 answers and choose one (right-tailed, left-tailed, two-tailed

2- Critical Value:

3- z=

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Extracted text: Facebook: A study showed that two years ago, the mean time spent per visit to Facebook was 20.2 minutes. Assume the standard deviation is a UU minutes. Suppose that a simple random sample of 103 visits was selected this year and has a sample mean of x = 19.2 minutes. A social scientist is interested to know whether the mean time of Facebook visits has decreased. Use the a0,10 level of significance and the critical value method with the table. (a) State the appropriate null and alternate hypotheses. (6) Compute the value of the test statistic. (c) State a conclusion. Use the a= 0.10 level of significance. Part: 0/5 Part 1 of 5 (a) State the nuil and alternate hypotheses. H: This hypothesis test is a (Choose one) test. right-talled left-tailed two-tailed


Extracted text: Part 2 of 5 Find the critical value(s). Round the answer(s) to three decimal places, if necessary. If there is more than one critical value, separate them with commas. Critical value(s): Part: 2 /5 Part 3 of 5 (b) Compute the value of the test statistic. Round the answer to at least two decimal places.