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  3. 1. assume that a sample is used to estimate a popu

1. Assume that a sample is used to estimate a population proportion p. Find the 90%...

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Basic Math

1. Assume that a sample is used to estimate a populationproportion p. Find the 90% confidence interval for asample of size 112 with 28% successes. Enter your answer as atri-linear inequality using decimals (not percents) accurate tothree decimal places.

2.  You want to obtain a sample to estimate apopulation proportion. Based on previous evidence, you believe thepopulation proportion is approximately 88%. You would like to be98% confident that your estimate is within 3% of the truepopulation proportion. How large of a sample size is required? n=________

3.  You want to obtain a sample to estimate apopulation mean. Based on previous evidence, you believe thepopulation standard deviation is approximately ?=43.7?=43.7. Youwould like to be 90% confident that your estimate is within 3 ofthe true population mean. How large of a sample size is required?n= _____

Answer & Explanation Solved by verified expert
4.5 Ratings (613 Votes)
Solution Given that1 n 112Point estimate sample proportion 28 0281 1 028 072At 90 confidence level 1 90 1 090 0102 005Z2    See Answer
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