Facebook: A study showed that two years ago, the mean time spent per visit to Facebook was

20.0 minutes.Assume the standard deviation is = 8.0 minutes.Suppose that a simple random sample of

104 visits was selected this year and has a sample mean of x= 19.0

minutes.A social scientist is interested to know whether the mean time of Facebook visitshas decreased.Use the

= 0.01 level of significance and theP-valuemethod with theTI-84calculator.

(a) State the appropriate null and alternate hypotheses.

(b) Compute theP-value.

(c) State a conclusion. Use the = 0.01 level ofsignificance.

(a) State the appropriate null and alternate hypotheses.

H0 : H1 : This hypothesis test is a (Choose one) test.