A survey found that 38% of 822 randomly sampled teens said that their parents checked to see what Web sites they visited. The following year the same question posed to 815 teens found 40% reporting such checks. Do these results provide evidence that more parents are checking? Let p1 and p2 be the proportions of parents checking the Web sites visited in the first and second years respectively. Choose the correct null and alternative hypotheses below. A. H0: p1−p2≠0 Ha: p1−p2=0 B. H0: p1−p2=0 Ha: p1−p2>0 C. H0: p1−p2>0 Ha: p1−p2<0 D. H0: p1−p2=0 Ha: p1−p2<0 Determine the test statistic. z=nothing (Round to two decimal places as needed.) Find the P-value. P=nothing (Round to four decimal places as needed.) State the result of this hypothesis. Assume α=0.05. Choose the correct answer below. A. Reject the null hypothesis. There is not sufficient evidence of an increase in the proportion of parents checking the Web sites visited by their teens. B. Fail to reject the null hypothesis. There is sufficient evidence of an increase in the proportion of parents checking the Web sites visited by their teens. C. Reject the null hypothesis. There is sufficient evidence of an increase in the proportion of parents checking the Web sites visited by their teens. D. Fail to reject the null hypothesis. There is not sufficient evidence of an increase in the proportion of parents checking the Web sites visited by their teens.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

A survey found that

38%

822

randomly sampled teens said that their parents checked to see what Web sites they visited. The following year the same question posed to

815

teens found

40%

reporting such checks. Do these results provide evidence that more parents are checking?

Let p1 and p2
be the proportions of parents checking the Web sites visited in the first and second years respectively. Choose the correct null and alternative hypotheses below.

H0: p1−p2≠0

Ha: p1−p2=0

H0: p1−p2=0

Ha: p1−p2>0

H0: p1−p2>0

Ha: p1−p2<0

H0: p1−p2=0

Ha: p1−p2<0

Determine the test statistic.

z=nothing

(Round to two decimal places as needed.)

Find the P-value.

P=nothing

(Round to four decimal places as needed.)

State the result of this hypothesis. Assume

α=0.05.

Choose the correct answer below.

Reject

the null hypothesis. There

is not

sufficient evidence of an increase in the proportion of parents checking the Web sites visited by their teens.

Fail to reject

the null hypothesis. There

sufficient evidence of an increase in the proportion of parents checking the Web sites visited by their teens.

Reject

the null hypothesis. There

sufficient evidence of an increase in the proportion of parents checking the Web sites visited by their teens.

Fail to reject

the null hypothesis. There

is not

sufficient evidence of an increase in the proportion of parents checking the Web sites visited by their teens.

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