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A First Course in Probability (10th Edition)

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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QUESTION 14

A researcher, after reviewing past salary payment records, revealed that a random sample of size n with a sampling fraction of 0.125, drawn from a finite population consisting of 2000 employees, showed a sample mean salary of R19500 per month. Answer the following questions.

Determine the sample total amount of money.
Estimate the total amount of money paid per month.
Estimate the standard error of the monthly average salary.
Construct and interpret a 95% confidence interval for µ.
Estimate the standard error of the monthly total salary.

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QUESTION 1 The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 100 hours. A random sample of 64 light bulbs indicates a sample mean life of 350 hours. (a) At the 0.05 level of significance, is there evidence that the mean life is different from 375hours? (b) Compute the p-value and interpret its meaning. (c) Construct a 95% confidence interval estimate of the population mean life of the light bulbs. (d) Compare the results of (a) and (c). What conclusions do you reach? Note: please clear Whois on answer (a), (b),(c), +d)
QUESTION 1 The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 100 hours. A random sample of 64 light bulbs indicates a sample mean life of 350 hours. (a) At the 0.05 level of significance, is there evidence that the mean life is different from 375hours? (b) Compute the p-value and interpret its meaning. (c) Construct a 95% confidence interval estimate of the population mean life of the light bulbs. (d) Compare the results of (a) and (c). What conclusions do you reach? Note: i need only (d) no question answer
Question 7:Many medical professionals believe that eating too much red meat increases the risk of heartdisease and cancer (WebMD website, March 12, 2014). Suppose you would like to conduct asurvey to determine the yearly consumption of beef by a typical American and want to use 3pounds as the desired margin of error for a confidence interval estimate of the populationmean amount of beef consumed annually. Use 25 pounds as a planning value for the population standard deviation and recommend a sample size for each of the followingsituations.a. A 90% confidence interval is desired for the mean amount of beef consumed.b. A 95% confidence interval is desired for the mean amount of beef consumed.c. A 99% confidence interval is desired for the mean amount of beef consumed.

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