Psychologists want to estimate the mean attention time given totwins per week by their parents. A sample of 147 sets of twin boysis taken and the attention time given to them by their parents in aweek is recorded. The results are a mean time of 40.83 hours witha standard deviation of 6.16 hours.Construct a 80% confidence interval for the population meanattention time given all twins.Round your answers to two decimal places.<<

Given that Sample size n =147 Sample mean =40.83 Standard deviation =6.16

Answered: twins per week by their parents. A…

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 adults have IQ scores that are normally distributed with a mean of 100.2 and a standard deviation 20.9. Find the first quartile Q₁, which is the IQ score separating the bottom 25% from the top 75%. (Hint: Draw a graph.) The first quartile is (Type an integer or decimal rounded to one decimal place as needed.)
Assume that adults have IQ scores that are normally distributed with a mean of 99.1 and a standard deviation 17.6. Find the first quartile Q,, which is the IQ score separating the bottom 25% from the top 75%. (Hint: Draw a graph.) The first quartile is. (Type an integer or decimal rounded to one decimal place as needed.)
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A random sample of 64 shoppers showed that they spend an average of $27.31 per visit at the Sunday Mornings Bookstore. The standard deviation of the population is $2.14. Find the 90% confidence interval of the true mean. Please include all work showing how you found your answer.
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