A sample survey by Nielsen Media Research looked at computer access and use of the Internet. Whites were significantly more likely than blacks to own a home computer, but the black-white difference in computer access at work was not gincant. The study team then looked separately at the households with at least $40,000 income. The sample contained 1904 white and 140 black households in this class. Here are the sample counts for these households.

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A sample survey by Nielsen Media Research looked at computer access and use of the Internet. Whites were significantly
more likely than blacks to own a home computer, but the black-white difference in computer access at work was not
Signiicant. The study team then looked separately at the households with at least $40,000 income. The sample contained
1904 white and 140 black households in this class. Here are the sample counts for these households.
Blacks Whites
Own home computer
1170
86
Computer access at work 105
1127
(a) Do higher-income blacks and whites differ significantly at the 5% level in the proportion who own home
computers?
P-value =
%3D
Conclusion
O There is significant evidence that the proportion of higher-income blacks and whites that own home
computers differs.
O There is no evidence that the proportion of higher-income blacks and whites that own home computers
differs.
(b) Do they differ significantly at the 5% level in the proportion who have computer access at work?
Z =
P-value =
Conclusion
There is significant evidence that the proportion of higher-income blacks and whites that have
computer access at work differs.
There is no evidence that the proportion of higher-income blacks and whites that have computer access
at work differs.
Transcribed Image Text:A sample survey by Nielsen Media Research looked at computer access and use of the Internet. Whites were significantly more likely than blacks to own a home computer, but the black-white difference in computer access at work was not Signiicant. The study team then looked separately at the households with at least $40,000 income. The sample contained 1904 white and 140 black households in this class. Here are the sample counts for these households. Blacks Whites Own home computer 1170 86 Computer access at work 105 1127 (a) Do higher-income blacks and whites differ significantly at the 5% level in the proportion who own home computers? P-value = %3D Conclusion O There is significant evidence that the proportion of higher-income blacks and whites that own home computers differs. O There is no evidence that the proportion of higher-income blacks and whites that own home computers differs. (b) Do they differ significantly at the 5% level in the proportion who have computer access at work? Z = P-value = Conclusion There is significant evidence that the proportion of higher-income blacks and whites that have computer access at work differs. There is no evidence that the proportion of higher-income blacks and whites that have computer access at work differs.
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