A random sample of 40 observations was used to estimate the mean SATscores of applicants at a business college. The 99% confidence interval wasfound to be (1690 , 1810). If we are to increase the sample size to 45 (otherfactors remain unchanged), the 99% confidence interval for the mean SATScores wouldObecome wider.be impossible to determine.become narrower.be the same.

We have given that for a sample of 40 99% confidence interval is (1690,1810)

Answered: A random sample of 40 observations was…

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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This data comes from the hours of sleep among nightshift and dayshift workers. How would i put into words the meaning of the confidence interval in relation to the topic
Thelma and Louise are each attempting to estimate the proportion of adults who enjoy listening to country music. They each survey a different random sample of adults, and in each sample, the proportion who say they enjoy listening to country music is 0.29. Thelma and Louise each use their sample data to construct a confidence interval. Thelma's interval is from 0.242 to 0.338 and Louise's interval is from 0.237 to 0.323. One of these intervals was computed correctly and the other was not. Which interval must be the correct one? It's impossible to answer this question without knowing the level of confidence used for each interval. It's impossible to answer this question without knowing the sample sizes. O It's impossible to answer this question without knowing the sample sizes or the level of confidence used for each interval. Thelma's interval must be the correct interval. O Louise's interval must be the correct interval.
In a survey of 2300 adults, 718 say they believe in UFOS. Construct a 90% confidence interval for the population proportion of adults who believe in UFOS. A 90% confidence interval for the population proportion is (,). (Round to three decimal places as needed.)
You want to create a confidence interval for the difference in the percent of people over 40 who took music lessons as children and the percent of people 20-40 who took music lessons as children. You decide to use the Plus Four method. You ask 30 people over 40 and find that 21 of them took music lessons as children. You ask 25 people 20-40 and find that 13 took music lessons as children. Fill in the blanks for what you would put into your calculator's interval function. Have people over 40 be group 1. X1 = n1 = X2 = n2 =
Suppose that you wanted to know if the percentage of people who will attend a sporting event this year will decrease. Last year, 43% of Americans attended a sporting event. After taking a sample, you attain a sample percentage of 18% with a margin of error of 3%. Construct a confidence interval and use that interval to determine if the number of Americans who will attend a sporting event has decreased. Show your calculation for the interval and then state your conclusion in complete sentences.
Use the information below to answer Questions #19 and #20. In a survey of 2327 adults, 726 say they believe in UFOS. Construct a 90% confidence interval for the population proportion of adults who believe in UFOS. Find the left end point for a 90% confidence interval. Round to three decimal places as needed.
If n-10, 2(xbar)-40, and s-4, construct a confidence interval at a 98% confidence level. Assume the data. came from a iormally distributed population. Give your answers to one decimal place.
If n=22, (x-bar)=34, and s=17, construct a confidence interval at a 99% confidence level. Assume the data came from a normally distributed population. Give your answers to one decimal place.
If the analyst decides to increase the sample size (n) from 75 to 100, while maintaining the same confidence level, the width of the confidence interval would then: fluctuate up and down. remain unchanged. decrease. increase.
Days before a presidential election, an article based on a nationwide random sample of registered voters reported the following statistic, "52% (±3%) of registered voters will vote for Robert Smith." What is the "±3%" called? The "±3%" is called the confidence interval for a proportion. margin of error. sample proportion. standard error.

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