James Desreumaux, VP of Human Resources of American First Banks

question 3

Multiple Choice

James Desreumaux, VP of Human Resources of American First Banks (AFB) , is reviewing the employee training programs of AFB.His staff randomly selected personnel files for 100 tellers in the southeast region and determined that their mean training time was 25 hours.Assume that the population standard deviation is 5 hours.The 95% confidence interval for the population mean of training times is ________.

• A)15.20 to 34.80
• B)24.18 to 25.82
• C)24.02 to 25.98
• D)16.78 to 33.23
• E)23.32 to 35.46

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Definitions:

r Values

r Values, often denoted as the correlation coefficient, measure the strength and direction of a linear relationship between two variables.

Spearman Rank Correlation

A non-parametric measure of correlation that assesses the strength and direction of the association between two ranked variables, useful for ordinal data.

Pearson Correlation

A measure of the linear correlation between two variables, quantifying the degree to which they vary together.

Normal Distribution

A probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence.