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

=x19.0

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

=0.01

level of significance and the P-value method with the TI-84 calculator.

(a) State the appropriate null and alternate hypotheses.

(b) Compute the P-value.

(c) State a conclusion. Use the

=0.01

level of significance.

Part: 0 / 4

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Part 1 of 4

(a) State the appropriate null and alternate hypotheses.

H0

:

H1

:

This hypothesis test is a (Choose one) test