A university wants to determine the population average grade of all students who take astatistics class online. The grade distribution of online statistics classes is normal. Theaverage grade of 20 online statistics classes is 60% with a standard deviation of 15%. Find a95% confidence interval for the average grade of all online statistics classes.(52.98, 67.02)(53.43, 66.57)(59.79, 60.21)O The sample size is too small to compute a confidence interval.

Confidence interval: It is defined as the range which contains the value of true population…

Answered: A university wants to determine the…

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 the heights of women are normally distributed with a mean of 62.4 inches and a standard deviation of 1.6 inches. Find Q3 the third quartile that separates the bottom 75% from the top 25%
Compute the mean, median, Variance and the standard deviation for the data below: 3,2,3, 4, 3, 5, 7, 7
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A researcher studied 5050 adults daily screen time. She had them record the amount of hours (rounded to the nearest hour) they spent looking, listening or reading at computer or cell phone daily. The frequency table below shows the results. Hours of Screen Time Frequency 7 5 8 6 9 4 10 5 11 8 12 10 13 9 14 3 The researcher found that the mean number of hours of the data set was 10.7210.72. She wants to also find range and standard deviation. Find the range of the data set.range = Find the standard deviation of the data setstandard deviation = Round your result to two decimal places.
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A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 122.7-cm and a standard deviation of 0.5-cm.Find P15, which is the length separating the shortest 15% rods from the longest 85%.P15 = -cm

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