The following is the distribution of amounts spent for research and developmentand for marketing for the year 2000 by 10 drug firms and cosmetic firms :Drug Cos.Cosmetic Cos.ExpenditureR and DMarketingR and DMarketing30.10-20320-3030-40334440-50(a) Compute the arithmetic mean for each type of company, for each type of expenditure.(b) Compute the standard deviation for each type of company, for each type of expenditure.(c) What conclusions do you draw from the results ?

Answered: Image /qna-images/answer/779a9618-2a0b-4894-8a77-d17b964338bf.jpg

Answered: The following is the distribution of…

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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For drivers in the 20-24 age bracket, there is a 34% rate of car accidents in one year (based on data from the National Safety Council.) An insurance investigator finds that in a group of 500 randomly selected drivers aged 20-24 living in a certain city, 40% of them had accidents in the last year. Assuming that the 34% rate applies to aged 20-24 living in that certain city, find the mean and standard deviation for the numbers of people in groups of 500 that can be expected to have accidents.
Suppose that the monthly incomes of all employees in Firm A are normally distributed with a mean of $1784.85 and a standard deviation of $199.23. What is the probability that a randomly selected employee from Firm A will have a monthly income which is greater than $1993.04535 (approximately)?
An article in Fortune magazine reported on the rapid rise of fees and expenses charged by mutual funds. Assuming that stock fund expenses and municipal bond fund expenses are each approximately normally distributed, suppose a random sample of 12 stock funds gives a mean annual expense of 1.63 percent with a standard deviation of .31 percent, and an independent random sample of 12 municipal bond funds gives a mean annual expense of 0.89 percent with a standard deviation of .23 percent. Let µ1 be the mean annual expense for stock funds, and let µ2 be the mean annual expense for municipal bond funds. Do parts a, b, and c by using the equal variances procedure. Then repeat a, b, and c using the unequal variances procedure. (c) Calculate a 95 percent confidence interval for the difference between the mean annual expenses for stock funds and municipal bond funds. Can we be 95 percent confident that the mean annual expense for stock funds exceeds that for municipal bond funds by…

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