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An educator wants to construct a 98% confidence interval for the proportion of elementary schoolchildren in Colorado who are proficient in reading. i. The results of a recent statewide test suggested that the proportion is 0.65. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.04? ii. Estimate the sample size needed if no estimate of p is available. O i. 770 ii. 846 O i. 547 ii. 601 O i. 944 ii. 1037 O i. 385 ii. 423

An educator wants to construct a 98% confidence interval for the proportion of elementary schoolchildren in Colorado who are proficient in reading. i. The results of a recent statewide test suggested that the proportion is 0.65. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.04? ii. Estimate the sample size needed if no estimate of p is available. O i. 770 ii. 846 O i. 547 ii. 601 O i. 944 ii. 1037 O i. 385 ii. 423

A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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An educator wants to construct a 98% confidence interval for the proportion of elementary schoolchildren in Colorado who are proficient in reading. i. The results of a recent statewide test suggested that the proportion is 0.65. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.04? ii. Estimate the sample size needed if no estimate of p is available. O i. 770 ii. 846 O i. 547 ii. 601 O i. 944 ii. 1037 O i. 385 ii. 423
Transcribed Image Text:An educator wants to construct a 98% confidence interval for the proportion of elementary schoolchildren in Colorado who are proficient in reading. i. The results of a recent statewide test suggested that the proportion is 0.65. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.04? ii. Estimate the sample size needed if no estimate of p is available. O i. 770 ii. 846 O i. 547 ii. 601 O i. 944 ii. 1037 O i. 385 ii. 423
A sample of size n = 45 has mean x = 10.5 and standard deviation s = 14.3. i. Construct a 99% confidence interval for u. ii. Estimate the sample size needed so that a 99% confidenceinterval for u will have a margin of error equal to 2.5. O i. 4.4 μ< 16.6 [Tech:4.5 < μ< 16.1] ii. 217 O i. 4.4 μ< 16.6 [Tech:4.5 < μ< 16.1] ii. 218 O i. 4.7 << 16.3 [Tech:4.8 μ< 16.2] ii. 217 O i. 4.7 < μ< 16.3 [Tech:4.8 < μ< 16.2] ii. 218
Transcribed Image Text:A sample of size n = 45 has mean x = 10.5 and standard deviation s = 14.3. i. Construct a 99% confidence interval for u. ii. Estimate the sample size needed so that a 99% confidenceinterval for u will have a margin of error equal to 2.5. O i. 4.4 μ< 16.6 [Tech:4.5 < μ< 16.1] ii. 217 O i. 4.4 μ< 16.6 [Tech:4.5 < μ< 16.1] ii. 218 O i. 4.7 << 16.3 [Tech:4.8 μ< 16.2] ii. 217 O i. 4.7 < μ< 16.3 [Tech:4.8 < μ< 16.2] ii. 218
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