Assume that a sample is used to estimate a population proportion p. Find the margin of error M.E. that corresponds to a sample of size 342 with 37.1% successes at a confidence level of 99.5%.
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Q: Assume that a sample is used to estimate a population proportion p. Find the margin of error M.E.…
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Q: Assume that a sample is used to estimate a population proportion p. Find the margin of error M.E.…
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Q: Assume that a sample is used to estimate a population proportion p. Find the margin of error M.E.…
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- A flower shop owner wants to estimate the proportion of people who enter the store that make a purchase. They want a 95% confidence interval on the proportion of people who enter the store that make a purchase with a margin for error of 0.04 or 4%. Their partner estimates that 20% (a proportion of 0.2) of the people who enter the store make a purchase so the owner will use that value when determining the sample size. What sample size should the flower shop take?Find the lower limit of 95% confidence interval. An SRS of 36 students were taken from high schools in a particular state. The average test score of the sampled students was 60 with a standard deviation of 13.26. Give the lower limit of the interval approximation.Find the critical value tc for a 95% confidence level when the sample size is 18. Use Table 4 on page A10 (Appendix) A. 1.740 B. 2.110 C. 2.101 D. 1.734
- You want to estimate the mean weight of quarters in circulation. A sample of 60 quarters has a mean weight of 5.682 grams and a standard deviation of 0.061 gram. Use a single value to estimate the mean weight of all quarters. Also, find the 95% confidence interval for the average weight of all quarters. The estimate for the mean weight of all quarters is (Round to three decimal places as needed.) grams. Find the 95% confidence interval for the mean weight of all quarters. grams < p< grams (Round to three decimal places as needed.)Assume that a sample is used to estimate a population proportion p. Find the margin of error M.E. that corresponds to a sample of size 319 with 20.1% successes at a confidence level of 90%. M.E.= 96 Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places. Round final answer to one decimal placeIf a sample is used to estimate a population proportion p. What is the the margin of error M.E. that corresponds to a sample of size 151 with 53% successes at a confidence level of 99.9
- Suppose we have data coming from 69 i.i.d) observations. The sample mean is JÓ28 and the sample standard deviation is calculated to be 1.63. Find a 95% confidence interval for the true mean.A researcher wants to make a 95% confidence interval for the population mean. She wants the maximum error of estimate to be within 4.8 of the population mean. The population standard deviation is 18.65. What would be the sample size the yield a maximum error of estimate within 4.8 of the population mean?A random sample of 180 men indicated that 50 were smokers, and a random sample of 150 women surveyed indicated that 39 smoked. Construct a 98% confidence interval for the true difference in proportions of male and female smokers.
- The percent defective for parts produced by a manufacturing process is targeted at 4%. The process is monitored daily by taking samples of sizes n = 160 units. Suppose that today's sample contains 14 defectives. Determine a 88% confidence interval for the proportion defective for the process todayA 95% confidence interval for the mean was computed with a sample of size 90 to be (16,22). b. What is the point estimate x̅ ?Obesity is defined as a body mass index (BMI) of 30 kg/m2 or more. A 95% confidence interval for the percentage of U.S. adults aged 20 years and over who were obese was found to be 20.26% to 29.8%. What was the sample size?