Question

In: Statistics and Probability

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 0.04 with 99% confidence if

a) she uses a previous estimate of 0.36?

b) she does not use any prior estimates?

Solutions

Expert Solution

At 99 % confidence level the Z score is 2.58 if the distribution is normal

a) If the prior estimate is 0.36 then the minimum samople is calculated as

b) if prior estimate is not available the sample proportion is assumed as 0.50

The Z score is computed by Z table shown below

orchestra answered 2 years ago
Next > < Previous

Related Solutions

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 95 % confidence if (a) she uses a previous estimate of 0.34 ? (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 0.01 with 90& 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 0.04 with 99​% confidence if ​(a) she uses a previous estimate of 0.34​? ​(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 0.54​? ​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 90​% confidence if ​a) she uses a previous estimate of 0.28​? ​ 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 0.05 with 99% confidence if (a) she uses a previous estimate of 0.54? (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 0.04 with 99% confidence if ​(a) she uses a previous estimate of 0.28​? (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 0.01 with 95% confidence if: ​(a) she uses a previous estimate of .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 0.04 with 95 % confidence: a) assuming a previous study concluded that the proportion of adults who have high-speed internet access was 0.48? b) assuming the researcher has no previous results to reference?
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 0.040.04 with 9999​% confidence if ​(a) she uses a previous estimate of 0.560.56​? ​(b) she does not use any prior​ estimates?
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT