# Statistics: Data Analysis

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Data Analysis
A study examined how long aircraft air conditioning units operated after being repaired. Here
are the operating times (in hours) for one unit:

32
51
58
63
65
69
90
97
98
100
103
106
117
118
118
120
124
128
129
132
150
152
185
196
225
231
289

a) Make a histogram of these data, using 40 hour wide classes, starting with 0<time < 40, 40
< time < 80,…..

b) Describe the overall shape of the distribution. Is it roughly symmetric, skewed to the right
, or skewed to the left? Are there any outliers?

c) Is the five number summary of the mean and standard deviation a better brief summary for this distribution? Explain your choice. Calculate the one of these summaries that you
choose.

• Statistics: Data Analysis - ,

I have given a site where you can find most of the information regarding general statements about confidence intervals. For the T test, Z test, etc. please show your calculations and someone will check them for you. By the way, this forum (and others like it on the Internet) simply cannot draw graphs, histograms, and the like. You can, however, find graphs and histograms that may be similar to your problem and compare your work to that which you find on the Internet.