Current Attempt in ProgressFor a population data set, o = 16.40.a. What should the sample size be for a 98% confidence interval for u to have a margin of error of estimateequal to 5.80?n=b. What should the sample size be for a 95% confidence interval for u to have a margin of error of estimateequal to 4.79?n =

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Answered: For a population data set, o = 16.40.…

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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Kim wants to determine a 80 % confidence interval for the true proportion ? of high school students in the area who attend their home basketball games. Out of ? randomly selected students she finds that that exactly half attend their home basketball games. About how large would ? have to be to get a margin of error less than 0.04 for ?? ?=
Suppose that you intend to find a 95% confidence interval for a population mean by applying the one-mean z-interval procedure to a sample of size 100. a. What would happen to the accuracy of the estimate if you used a sample of size 50 instead but kept the same confidence level of 0.95?b. What would happen to the accuracy of the estimate if you changed the confidence level to 0.90 but kept the same sample size of 100?
Kim wants to determine a 99 percent confidence interval for the true proportion of high school students in the area who attend their home basketball games. How large of a sample must she have to get a margin of error less than 0.03? [Round to the smallest integer that works.] n =
Kim wants to determine a 95 percent confidence interval for the true proportion p of high school students in the area who attend their home basketball games. Out of n randomly selected students she finds that that exactly half attend their home basketball games. About how large would n have to be to get a margin of error less than 0.04 for p?
Dylan wants to determine a 90 percent confidence interval for the true proportion of high school students in the area who attend their home basketball games. How large of a sample must he have to get a margin of error less than 0.03? [Note that you don't have an estimate for p*!]
Assume that you want to construct a 95% confidence interval estimate of a population mean. Find an estimate of the sample size needed to obtain the specified margin of error for the 95% confidence interval. The sample standard deviation is given. Margin of error, E=3.4 minutes; sample standard deviation, s=55.3minutes The required sample size is?
. A researcher collects a sample of 24 measurements from a population and wishes to find a 99% confidence interval for the population mean. What value should he use for t*? b. If he instead decides to use a 95% confidence interval, will the interval be wider or be narrower or stay the same? Why?
Cora wants to determine a 90 percent confidence interval for the true proportion of high school students in the area who attend their home basketball games. How large of a sample must she have to get a margin of error less than 0.02? [Note that you don't have an estimate for p*!] [Round to the smallest integer that works.] n
In order to infer on the mean height of children in a school , a sample of 36 students were considered and it was found that mean and standard deviation based on the sample are 120 cm and 30 cm respectively. then what would be the standard error for the sample mean? a. 3.33 b. 20 c. 0.83 d. 5 What would be the critical value? a. 0.0126 b. 2.03 c. 2.72 d. 3 What would be your conclusion based on the confidence interval being 99%? a. With 99% confidence, the population mean is between 106.4 cm and 133.6 cm. b. With 99% confidence, the sample mean is between 106.4 cm and 133.6 cm c. 99% of the children in the population has height between 106.4 cm and 133.6 cm d. 99% of the children in the sample has height between 106.4 cm and 133.6 cm.
A human resource manager wants to see if there is a difference in the proportion of minority applicants who get the job and the proportion of Caucasian applicants who get the job. After reviewing the records, she came up with the following confidence interval for the difference between the proportions: [ − 0.15 , − 0.07 ] . The sample mean difference was -0.11. The error bound is defined by:
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Dylan wants to determine a 99 percent confidence interval for the true proportion of high school students in the area who attend their home basketball games. How large of a sample must he have to get a margin of error less than 0.04? [To find n, use the value p* = 1/2 for the sample proportion and the values for z* from a z-table or t-table.] [Round to the smallest integer that works.] n =

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For a population data set, o = 16.40. a. What should the sample size be for a 98% confidence interval for u to have a margin of error of estimate equal to 5.80? n = i b. What should the sample size be for a 95% confidence interval for u to have a margin of error of estimate equal to 4.79? n= i