Difference 17 25 14 -10 20 40 35 30 28 22 15 5 A What sample size should she select? Population Standard Deviation 30 Sampling Error 5 Confidence Level 95% Z Value -1.95996398 Calculated Sample Size 138.292518 Sample Size Needed 139 3.8416 900 25 138.2976 B Construct a 90% confidence interval estimate for the population proportion of reimbursetments th Sample Size 139 Number of Successes 12 Confidence Level 90% Sample Proportion 0.08633094 Z Value -1.64485363 INTERMEDIATE CALCULATION DATA INTERMEDIATE CALCULATION RESULT DATA 139 2976 . 138 5 30 96 . 1 2 2 2 2 2 2 2 / n n n e Zn a
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E Construct a 95% confidence interval estimate for the total difference between the amount reimbur
Population Size 25,056
Sample Size 139
Confidence Level 95%
Sum of Differences 241 Average Difference in Sample 1.73381295
Total Difference 43,442Standard Deviation of Differences 1.66327691FPC Factor 0.9972Standard Error of the Total Differen 3525.08483Degrees of Freedom 138t Value 1.9773Interval Half Width 6970.16272
Number of Differences Not = 0 12Number of Differences = 0 127SS for Differences Not = 0 0SS for Differences = 0 381.775633Sum of Squares 381.775633Variance of Differences 2.76649009