A certain test preparation course is designed to help students improve their scores on the LSAT exam. A mock exam is given at the beginning and end of the course to determine the effectiveness of the course. The following measurements are the net change in 5 students' scores on the exam after completing the course:20, 26, 20, 11, 19Using these data, construct a 90% confidence interval for the average net change in a student's score after completing the course. Assume the population is approximately normal.**Step 3 of 4:** Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.**Answer:**[Text box for the answer]---This activity is related to calculating a confidence interval, which is a range of values that is used to estimate a population parameter. The critical value is crucial in determining the width of this interval, which in turn impacts the precision of your estimation.*Note: The page includes a section for entering the answer and submitting it, but no graphs or diagrams are present.*

Solution To find the confidence interval we will use t distribution.

Answered: A certain test preparation course is…

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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A learn-to-type software program claims that it can improve your typing skills. To test the claim and possibly help yourself out, you and six of your friends decide to try the program and see what happens. Use the table below to construct an 80% confidence interval for the true mean change in the typing speeds for people who have completed the typing program. Let Population 1 be the typing speed before taking the program and Population 2 be the typing speed after taking the program. Round the endpoints of the interval to one decimal place, if necessary. Typing Speeds (in Words per Minute) Before After 32 33 51 42 55 40 35 32 54 33 45 30 50 52

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