Fatema computed a 95% confidence interval for the average time (inminutes) spent on social networking daily by college students in UAE as(107.12, 112.88). Which of the following would be a 90% confidenceinterval calculated from the same set of sample data that Fatema used toconstruct the 95% confidence interval above?(104.66, 114.34)(106.81, 113.19)(107.58, 112.42)(106.21, 113.79)

Given that, Fatema computed a 95% confidence interval for the average time spent on social…

Answered: Fatema computed a 95% confidence…

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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From a sample of 2412 Jawas, 1013 said they had recently sold a stolen droid to a moisture farmer. Construct a 99% confidence interval for the true proportion of Jawas that sell stolen droids to moisture farmers.
A 90% confidence interval for the mean of airline reservations being canceled on the day of the flight is between 2.68 and 9.42 reservations. What is the point estimate of the mean of reservations that are canceled on the day of the flight?
A recent study by the McGraw-Hill company showed that 61% (1621) of college students use their smartphones for studying. The sample size for this poll was 2657 students. Create a 95% confidence interval for the true proportion of all college students who use their smartphones to study. Round to two decimal places.
A 90% confidence interval for the mean percentage of airline reservations being canceled on the day of the flight is (1.3%, 5.1%). What is the point estimate of the mean percentage of reservations that are canceled on the day of the flight?
A quality control inspector selects 12 bottles of apple juice at random from a single day’s production. The mean amount of apple juice in the bottles is 298.3 milliliters, and the 95% confidence interval for the true mean amount of juice dispensed per bottle is (296.4, 300.2). Does this interval give the quality control inspector reason to believe that the mean amount of juice in today’s bottles differs from 300 milliliters, as the juice label promises? Yes, since the sample mean of 298.3 ml is less than 300 ml. Yes, since nearly the entire confidence interval is less than the advertised value of 300 ml. No, since the sample mean of 298.3 ml is in the confidence interval. No, since the advertised value of 300 ml is in the confidence interval.
A random sample of prices of petrol per litre (in p per litre) from UK filling stations was taken during November 2021. Based on these data, a 95% confidence interval for the mean price of petrol per litre (in p per litre) was found to be (131.42, 142.22). Given that 1 litre is equivalent to 0.22 gallons calculate a 95% confidence interval for the mean price of petrol from UK filling stations in p per gallon. Explain your reasoning.
A study by a University found that one in five 13- and 14-year-olds is a sometime smoker, To see how the smoking rate of the students at a large school district compared to the national rate, a Teacher surveyed two hundred 13- and 14-year-old students and found that 23% said they were sometime smokers. Find the 99% confidence interval of the true proportion and compare this with the University of Michigan's study.
The mileage a car got on 5 trips from Greenwood to Greenville was used to create a 90% confidence interval for the true mean mileage of such trips. The 90% confidence interval is (32.32, 38.32). Explain in a sentence what this confidence interval says about the car's gas mileage (in miles per gallon).
A researcher comparing the means of dependent samples consisting of 30 matched pairs and obtained a mean difference of 5 and a standard error of the mean difference of 2. The confidence interval for the mean difference was (1.6, 8.4). What confidence level was used in constructing the interval?
There is a sample of 30 people and their shower times. What is the 95% confidence interval when sample mean is 23.50 minutes and standard deviation is 9.69 minutes?
The PIIE Bank in ORSP has 650 checking account customers. A recent sample of 50 of these customers showed 26 to have a Visa card with the bank. Construct the 99 percent confidence interval for the proportion of checking account customers who have a Visa card with the bank.( separate your answers with "and")
A large public opinion polling agency plans to conduct a national survey to determine the proportion of employed adults who fear losing their job within the next year. They found that 35 out of 100 randomly selected employed adults fear losing their job within the next year. How many workers must be polled in order to construct a 95% confidence interval estimate with a margin of error of 1%? leave answer to 3 decimals if decimal

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