The Frequency Table Below Shows the Number of Days Off

question 123

Essay

The frequency table below shows the number of days off in a given year for 30 police detectives. $$\begin{array} { | r | c | } \hline \text { Days off } & \text { Frequency } \\\hline 0 - 2 & 10 \\3 - 5 & 1 \\6 - 8 & 7 \\9 - 11 & 7 \\12 - 14 & 1 \\15 - 17 & 4 \\\hline\end{array}$$ Construct a histogram. Use the class midpoints for the horizontal scale. Does the result appear to be a normal
distribution? Why or why not?

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Definitions:

Null Hypothesis

In statistical hypothesis testing, it is the hypothesis that there is no effect or no difference, and any observed deviation is due to chance.

Control Chart

A graphical tool used in process control to display how a process varies over time, highlighting whether a process is in control or if there are signs of an out-of-control process.

Sample Means

Calculations of the average values derived from samples, representing estimates of the population mean.

Average Run Length

In statistical process control, the expected number of samples that will be taken before an action signal is generated.