A recent survey of 50 workers for the starting monthly salary in PKR employed in the construction industry is given in the following table. 45 28 36 33 25 49 48 38 40 38 34 39 45 26 40 45 35 38 22 46 60 39 35 38 33 35 57 48 35 32 45 46 38 42 43 28 33 38 40 49 38 49 53 40 33 25 28 33 40 38 a. Construct 90%, 95% and 99% confidence interva

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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1. A recent survey of 50 workers for the starting monthly salary in PKR employed in the construction industry is given in the following table. 45 28 36 33 25 49 48 38 40 38 34 39 45 26 40 45 35 38 22 46 60 39 35 38 33 35 57 48 35 32 45 46 38 42 43 28 33 38 40 49 38 49 53 40 33 25 28 33 40 38 a. Construct 90%, 95% and 99% confidence intervals for the population mean and interpret your answers. b. Determine the sample sizes needed if for the above mentioned confidence intervals the margin of error for the estimated mean lies within Rs. 1200 of the actual. c. Construct 80%, 90% and 99% confidence interval for the proportion of workers who have starting salary of less than PKR 30,000.
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