A researcher wishes to estimate the proportion of adults who have high-speed Internet access.
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 90% confidence if
(a) she uses a previous estimate of 0.46?
(b) she does not use any prior estimates?
Homework Answers
Sample size = Z2
/2
* p (1 - p) / E2
a)
Given p= 0.46
Sample size = 1.64492 * 0.46 * 0.54 / 0.012
= 6720.9
Sample size = 6721 (Rounded up to nearest integer)
b)
When prior estimate of proportion is not specified then p = 0.50
Sample size = 1.64492 * 0.50 * 0.50 / 0.012
= 6764.24
Sample size = 6765 (Rounded up to nearest integer)
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A researcher wishes to estimate the proportion of adults who have high-speed Internet access.
A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size...
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 90 % confidence if (a) she uses a previous estimate of 0.46 ? (b) she does not use any prior estimates? (a) nequals nothing (Round up to the nearest integer.) (b) nequals nothing (Round up to the nearest integer.)
A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size...
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 0.03 with 90% confidence if (a) she uses a previous estimate of 0.58? (b) she does not use any prior estimates?
A researcher wishes to estimate the proportion of adults who have high-speed internet access. What size...
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 .05 with 90% confidence if A. She uses a previous estimate of .48? B. She does not use any prior estimates?
A researcher wishes to estimate the proportion of adults who have high speed internet access. What...
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 0.03 with 90% confidence if (a) she uses a previous estimate of 0.28? (b) she does not use any prior estimates? n=_____(Round up to the nearest integer.)
A researcher wishes to estimate the proportion of adults who have high-speed internet access. What size...
A researcher wishes to estimate the proportion of adults who have high-speed internet access. What size sample should be obtained if she wishes to estimate to be within 0.02 with 95% confidence if (a) She uses a previous estimate of 0.38? (b) she does not use any prior estimates?
A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size...
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 0.05 with 99% confidence if (a) she uses a previous estimate of 0.48? (b) she does not use any prior estimates?
A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size...
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 0.02 with 95% confidence if (a) she uses a previous estimate of 0.42? (b) she does not use any prior estimates?
A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size...
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 0.050.05 with 9090% confidence if a) she uses a previous estimate of 0.36? b) she does not use any prior estimates?
A researcher wishes to estimate the proportion of adults who have high speed Internet...
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 0.05 with 99% confidence if (a) she uses a previous estimate of 0.587?(b) she does not use any prior estimates?
A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size...
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 0.03 with 90% confidence if (a) she uses a previous estimate of 0.54? (b) she does not use any prior estimates? Click the icon to view the table of critical values. (a) n=(Round up to the nearest integer.)
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 0.03 with 90% confidence if (a) she uses a previous estimate of 0.54? (b) she does not use any prior estimates? Click the icon to view the table of critical values. (a) n=(Round up to the nearest integer.)
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