One:

Construct a 95% confidence interval of the population proportion using the given information. x = 105, n = 150 X Table of critical values Click here to view the table of critical values. Level of Confidence, Area in Each Tail, ? Critical Value, z (1 - c) . 100% The lower bound is. 90% 0.05 1.645 95% 0.025 1.96 The upper bound is. 99% 0.005 2.575 (Round to three decimal places as needed.) Print DoneA 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 99% confidence if (a) she uses a previous estimate of 0.56? (b) she does not use any prior estimates? Click the icon to view the table of critical values. - X Table of critical values (a) n= (Round up to the nearest integer.) Level of Confidence, Area in Each Tail, Critical Value, z; (1 - c) . 100% 90% 0.05 1.645 95% 0.025 1.96 99% 0.005 2.575 Print Done