Question
A study of 203 police officers in an eastern state found that their mean salary was $75,500 with a sample standard deviation of $3,000. The
A study of 203 police officers in an eastern state found that their mean salary was $75,500 with a sample standard deviation of $3,000. The same study of 245 police officers in a northern state found that their mean salary was $74,500 with a sample standard deviation of $4,000.
Let group 1 be the eastern state police officers and group 2 be the northern state police officers.
Find the lower bound of a 95% confidence interval for the mean salary difference of police officers between an eastern state and a northern state.
Find the upper bound of a 95% confidence interval for the mean salary difference of police officers between an eastern state and a northern state.
Find the lower bound of a 95% confidence interval for the mean salary difference of police officers between an eastern state and a northern state. Let us assume that the standard deviations for both groups are the same.
Find the upper bound of a 95% confidence interval for the mean salary difference of police officers between an eastern state and a northern state. Let us assume that the standard deviations for both groups are the same.
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College Algebra Graphs and Models
Authors: Marvin L. Bittinger, Judith A. Beecher, David J. Ellenbogen, Judith A. Penna
5th edition
321845404, 978-0321791009, 321791002, 978-0321783950, 321783956, 978-0321845405
