A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.01 with 95% confidence if (a) she uses a previous estimate of 0.28? (b) she does not use any prior estimates? Click the icon to view the table of critical values. Table of critical values (a) n = (Round up to the nearest integer.) Level of Confidence, Area in Each Tail, 2 Critical Value, a , (1 - a) 100% 90% 0.05 1.645 95% 0.025 1.96 99% 0.005 2.575 -

MATLAB: An Introduction with Applications
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A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be
within 0.01 with 95% confidence if
(a) she uses a previous estimate of 0.28?
(b) she does not use any prior estimates?
Click the icon to view the table of critical values.
Table of critical values
(a) n =
(Round up to the nearest integer.)
Level of Confidence,
Area in Each Tail,
2
Critical Value, a
,
(1 - a) 100%
90%
0.05
1.645
95%
0.025
1.96
99%
0.005
2.575
-
Transcribed Image Text:A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.01 with 95% confidence if (a) she uses a previous estimate of 0.28? (b) she does not use any prior estimates? Click the icon to view the table of critical values. Table of critical values (a) n = (Round up to the nearest integer.) Level of Confidence, Area in Each Tail, 2 Critical Value, a , (1 - a) 100% 90% 0.05 1.645 95% 0.025 1.96 99% 0.005 2.575 -
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