A research analyst is examining a stock for possible inclusion in his client's portfolio. Over a 19-year period, the sample mean andthe sample standard deviation of añnual returns on the stock were 21% and 15%, respectively. The client wants to know if the risk,as measured by the standard deviation, differs from 18%. (You may find it useful to reference the appropriate table: chi-squaretable or F table)a. Construct the 90% confidence intervals for the population variance and the population standard deviation. (Roundintermediate calculations to at least 4 decimal places and final answers to 2 decimal places.)Confidence IntervalsPopulation variancePopulation standard deviationtotob. What assumption did you make in constructing the confidence intervals?

a. Construct the 90% confidence intervals for the population variance and the population standard deviation. (Round intermediate calculations to at least 4 decimal places and final answers to 2 decimal places.) Confidence Intervals Population variance Population standard deviation to to

a. Construct the 90% confidence intervals for the population variance and the population standard deviation. (Round intermediate calculations to at least 4 decimal places and final answers to 2 decimal places.) Confidence Intervals Population variance Population standard deviation to to

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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Concept explainers

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.

Question

A research analyst is examining a stock for possible inclusion in his client's portfolio. Over a 19-year period, the sample mean and
the sample standard deviation of añnual returns on the stock were 21% and 15%, respectively. The client wants to know if the risk,
as measured by the standard deviation, differs from 18%. (You may find it useful to reference the appropriate table: chi-square
table or F table)
a. Construct the 90% confidence intervals for the population variance and the population standard deviation. (Round
intermediate calculations to at least 4 decimal places and final answers to 2 decimal places.)
Confidence Intervals
Population variance
Population standard deviation
to
to
b. What assumption did you make in constructing the confidence intervals?

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