According to the National Bureau of Economic Research, the lengths of business cycles from 1919 to 1995, measured from trough to trough (a trough is the low point) in months, were
MAT135 Introduction to Statistics and Data Analysis
Module 4 TEST
Test 3
Name _______________________________
1. According to the National Bureau of Economic Research, the lengths of business cycles from 1919 to 1995, measured from trough to trough (a trough is the low point) in months, were
61 38 46 50 74 73 98 58
65 57 44 127 62 74 38 110
a.) Find the Mean
b.) Find the Median
c.) Find the Mode
d.) Find the Midrange
e.) Find the Standard Deviation
2. The densities of selected gases in kilograms per cubic meter are
Air 1.22 Neon 0.95
Carbon Dioxide 2.03 Nitrogen 1.30
Carbon monoxide 1.30 Nitrous Oxide 2.05
Helium 0.23 Oxygen 1.48
Hydrogen 0.14 Propane 2.07
Methane 0.77 Sulfur Dioxide 2.98
a.) Find the Mean
b.) Find the Median
c.) Find the Mode
d.) Find the Midrange
e.) Find the Standard Deviation
3. It has been claimed that for samples of size n=10 the range should be roughly three times as large as the standard deviation. Check this claim with reference to the following test scores, which 10 students obtained on an examination: 73, 86, 68, 67, 87, 80, 60, 76, 71, and 82. (10 points)
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