Five randomly selected batches of a chemical were tested for impurity concentration. The percentage impurity levels found in this sample were as follows: 3 4 2 2 3 a) Find the most efficient estimates of the population mean and variance which are sample mean and sample variance. b) Find a 90% confidence interval for the population’s mean score. c) Without doing the calculations, state whether a 95% confidence interval for the population mean would be wider or narrower than the interval found in part b.
Five randomly selected batches of a chemical were tested for impurity concentration. The percentage impurity levels found in this sample were as follows: 3 4 2 2 3 a) Find the most efficient estimates of the population mean and variance which are sample mean and sample variance. b) Find a 90% confidence interval for the population’s mean score. c) Without doing the calculations, state whether a 95% confidence interval for the population mean would be wider or narrower than the interval found in part b.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 1GP
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Five randomly selected batches of a chemical were tested for impurity concentration. The
percentage impurity levels found in this sample were as follows:
3 4 2 2 3
a) Find the most efficient estimates of the population
sample mean and sample variance.
b) Find a 90% confidence interval for the population’s mean score.
c) Without doing the calculations, state whether a 95% confidence interval for the
population mean would be wider or narrower than the interval found in part b.
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