Which of the following does NOT correctly describe how the width of a confidence interval for a population mean changes when the population standard deviation is known?O The interval changes if the sample size decreases.O The interval changes if the sample size increases.O The interval narrows if the sample size increases and confidence level stays the same.O The interval widens if the sample size decreases and the confidence level stays the same.O The interval widens if the sample size stays the same and confidence level decreases.

When the population standard deviation is known, the confidence interval for the population mean is…

Answered: Which of the following does NOT…

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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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, Eequals=6.1 grams; sample standard deviation, sequals=65.6grams The required sample size is _______? (Round up to the nearest whole number.
If a school district takes a random sample of 56 Math SAT scores and finds that the average is 488, and knowing that the population standard deviation of Math SAT scores is intended to be 100. Find a 99% confidence interval for the mean math SAT score for this district._____<μ<_____
Help. How do you find the solution. Where do you start?
You measure the lifetime of a random sample of 64 tires of a certain brand. The sample mean is = 50 months. Suppose that the lifetimes for tires of this brand follow a Normal distribution, with unknown mean and standard deviation = 3.79 months A 99% confidence interval for is: a. 40.2 to 59.8. b. 48.39 to 51.61. c. 48.78 to 51.22. d. 49.8 to 50.2.
A survey of 50 young professionals found that they spent an average of $24.15w hen dining out, with a standard deviation of $12.06. Can you conclude statistically that the population mean is greater than $27? Use a 95% confidence interval is. The 95% confidence interval is _____ , _______As $27 is__________ of the confidence interval, we________ , conclude that the population mean is greater than $27. (Use ascending order. Round to four decimal places as needed.)
If a school district takes a random sample of 55 Math SAT scores and finds that the average is 422, and knowing that the population standard deviation of Math SAT scores is intended to be 100. Find a 99% confidence interval for the mean math SAT score for this district. ______ ≤ μ ≤ _______
You are interested in finding a 95% confidence interval for the average number of days of class that college students miss each year. The data below show the number of missed days for 13 randomly selected college students. Round answers to 3 decimal places where possible. 7 5 3 9 11 6 4 12 0 6 0 6 2 With 95% confidence the population mean number of days of class that college students miss is between ------- and ----------- days.
Pls help ASAP. Pls show all work.
13 It is estimated that 80% of Americans go out to eat at least once per week, with a margin of error of 0.03 (for 95% confidence). A 95% confidence interval for the population proportion of Americans who go out to eat once per week or more is ______, ______. a 0.77 0.83 b 0.76 0.84 c 0.75 0.85 d 0.74 0.86
A research scholar wants to know how many times per hour a certain strand of virus reproduces. He wants to construct the 80 % confidence interval with a maximum error of 0.17 reproductions per hour. Assuming that the mean is 12.7 reproductions and the variance is known to be 3.61. what is the minimum sample size required for the estimate? Round your answer up to the next integer. AnswerHow to enter your answer (opens in new window) E Tables E Keypad Keyboard Shortcuts Ne Prev 2021 Hawkes Learning JIS A
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A sample is used to construct a confidence interval for an unknown population Which of the following is the least likely to result in a decrease in the margin of error? Increasing the sample size Increasing the confidence level Decreasing the confidence level A change in the standard deviation of the

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