QUESTION 9A population has a standard deviation of 8. What is the minimum sample size needed to estimate a mean to within 2 units with 66.8% confidence?O A. 13ОВ. 15ОС. 14O D. 12O E. 16QUESTION 10A sample of 40 is taken from a population where the population standard deviation is known to be 5. What zshould be used for an 78.7% confiden'a12estimate of the mean, rounded to five decimal places?O A. 1.24518O B. 1.24526OC1 24541DELLF10F8EscF6F7F4F5F3#2$%734

Q.9) Given : Margin of error, ME = 2.0 population standard deviation, σ =…

Answered: QUESTION 9 A population has a standard…

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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You want to estimate the mean amount of time Internet users spend on Facebook each month. How many Internet users must be surveyed in order to be 90% confident that your sample mean is within 10 minutes of the population mean? Based on results from a prior survey, assume that the standard deviation of the population of monthly times spent on Facebook is 210 minutes.
Round up to the nearest whole number.
Assuming a population mean of 900 and a population standard deviation of 200 for LCSW scores. What percentage of individuals have LCSW scores greater than 1100? Plot answer on a normal distribution curve.
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Mr 8. The results for an IQ quiz taken by 8 students from Ze Class A and Class B are shown below. The fal maximum score for the quiz is 25. we Class A: 4, 6, 6, 7, 8, 10, 11, 12 Class B: 0, 1, 1, 2, 3, 14, 17, 25 (i) Calculate the mean and standard deviation for Class A and Class B. Show your working clearly.
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