**What Influences the Sample Size Needed?**In this exercise, we examine the effect of the confidence level on determining the sample size needed.Find the sample size needed to give a margin of error within ±2 with 99% confidence, 95% confidence, and 90% confidence. Assume that we use \( \tilde{\sigma} = 30 \) as our estimate of the standard deviation in each case.Round your answers up to the nearest integer.- **99%:** \( n = \) [input box]- **95%:** \( n = \) [input box]- **90%:** \( n = \) [input box]

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Answered: What Influences the Sample Size Needed?…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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QUESTION TWO: The following marks were obtained by candidates in an examination (no fractions of a mark were awarded): Number of candidates Marks 0-5 6-10 8. 11-15 20 16-20 30 21-25 50 26-30 80 31-35 120 36-40 150 41-45 200 46-50 220 51-55 280 56-60 320 .61-65 260 66-70 160 71-75 120 76-80 100 81-85 60 86-90 40 91-95 17 96-100 3 Total 2240 Required: 1. Construct a 'less than' ogive and estimate the following: The sixth decile The 42nd percentile (warning: think carefully about the class limits
You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately o = 24.3 dollars. You would like to be 99% confident that your estimate is within 10 dollar(s) of average spending on the birthday parties. How many parents do you have to sample? n =
Use the normal distribution to find a confidence interval for a proportion p given the relevant sample results. Give the best point estimate for p, the margin of error, and the confidence interval. Assume the results come from a random sample. A 90% confidence interval for p given that p = 0.9 and n 130. Round your answer for the point estimate to two decimal places, and your answers for the margin of error and the confidence interval to three decimal places. Point estimate = Margin of error = ± i The 90% confidence interval is i to i
Use the given confidence interval to find the margin of error and the sample proportion. (0.729,0.755) E=enter your response here (Type an integer or a decimal.)
Use the normal distribution to find a confidence interval for a proportion p given the relevant sample results. Give the best point estimate for p, the margin of error, and the confidence interval. Assume the results come from a random sample. A 99% confidence interval for p given that p = 0.33 and n = 550. Round your answer for the best point estimate to two decimal places, and your answers for the margin of error and the confidence interval to three decimal places.
You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately o = 61.5 dollars. You would like to be 90% confident that your estimate is within 1.5 dollar(s) of average spending on the birthday parties. How many parents do you have to sample? n =
We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers believe the population standard deviation is approximately �=76.4. We would like to be 95% confident that the estimate is within 0.5 of the true population mean. How large of a sample size is required?�=
You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately 79.8. You would like to be 95% confident that your estimate is within 5 of the true population mean. How large of a sample size is required?
Use the confidence interval to find the margin of error and the sample mean. (1.62,1.90) The margin of error is (Round to two decimal places as needed.) The sample mean is
You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately o = 22.3. You would like to be 98% confident that your estimate is within 3 of the true population mean. How large of a sample size is required? Do not round mid-calculation. n =

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