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9.37 A study was conducted to determine if a certain treatment has any effect on the amount of metal removed in a pickling
operation. A random sample of 100 pieces was immersed in a bath for 24 hours without the treatment, yielding an average of 12.2
millimeters of metal removed and a sample standard deviation of 1.1 millimeters. A second sample of 200 pieces was exposed to the
treatment, followed by the 24-hour immersion in the bath, resulting in an average removal of 9.1 millimeters of metal with a sample
standard deviation of 0.9 millimeter. Compute a 98% confidence interval estimate for the difference between the population means.
Does the treatment appear to reduce the mean amount of metal removed?
In the context of choosing a "whole", explain when a "fifth" is not always equal to a "fifth".
For N= 20 and n = 18, how many possible combinations of samples without replacement can be formed?Find the 90th. Percentile of the t-distribution if the sample size is 25
Find the 99th. Percentile of the t-distribution with 18 degrees of freedom?
Check whether the interval [7,10[ and ]3,6] are equivalent or not
Less than z = -2.33, P(z<2.33)
Explain how to use a zero-one matrix to represent a relation on a finite set
A printer manufacturing company claims that it's new ink-efficient printer can print an average of 1500 pages of word documents with standard deviation of 60. Thirty-five of these printers showed a mean of 1475 pages. Does this support the company's claim? Use 95% confidence level.
It is claimed that the mean annual salary of call center customer service representative is php 188 584.00. A researcher randomly selected 45 call center customer service representative. He computed the mean of their annual salaries and obtained a mean of php 188 600.00. Does this show that the mean salary of call center customer service representatives is greater than php 188 584.00? Use 0.05 level of significance and assume that the population standard deviation is php 39.50.
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#340153 on Dec 2023