In this module, you explore the normal distribution. A standard normal distribution has a mean of zero and standard deviation of one. The z-score statistic converts a non-standard normal distribution into a standard normal distribution allowing us to use Table A-2 in your textbook and report associated probabilities.
The following table reports simulated annual flying squadron costs (in millions of dollars) at the following locations:
Here is what need to go a long with spreadsheet and StatDisk results in the discussion area along with a narrative of my findings and the responses to the questions below.
Do these costs appear to come from a population that has a normal distribution? Why or why not?
Can the mean of your data sample be treated as a value from a population having a normal distribution? Why or why not?
Did an “unusually low” or “unusually high” z-score value occur?
Was the associated z score probability value less than 0.05 (p < 0.05); meaning a “significantly low” or “significantly high” event? If yes, what are the implications for the base and/or aircraft?
What were your findings? Hint: focus on the calculated mean, standard deviation and z-score (include probability) to interpret your results.