A firm purchases a very large quantoty of metal off-cuts and wishes to know the average weight of an off-cut. A random sample of 625 off-cuts is weighed and it is found that the mean sample weight is 150grams with a sample standard deviation of 30 grams. what is the estimate of the ppopiulatiom mean and what is the standard error of the mean? What would be standard error if the sample size size was 1225?

A firm purchases a very large quantoty of metal off-cuts and wishes to know the average weight of an off-cut. A random sample of 625 off-cuts is weighed and it is found that the mean sample weight is 150grams with a sample standard deviation of 30 grams. what is the estimate of the ppopiulatiom mean and what is the standard error of the mean? What would be standard error if the sample size size was 1225?

Calculus For The Life Sciences

2nd Edition

ISBN:9780321964038

Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Chapter13: Probability And Calculus

Section13.2: Expected Value And Variance Of Continuous Random Variables

Problem 10E

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Question

Definition Definition Number of subjects or observations included in a study. A large sample size typically provides more reliable results and better representation of the population. As sample size and width of confidence interval are inversely related, if the sample size is increased, the width of the confidence interval decreases.

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