Before starting to change a belt on a belt drive blower, the technician should:
A) Wedge a metal bar between the pulley and the unit housing to prevent it from starting.
B) Turn the power to the unit off and lock it out.
C) Turn the thermostat off and leave instructions not to turn it on.
D) Put on heavy work gloves in case the unit is inadvertently started while changing the belt.
B
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Fill in the blank(s) with the appropriate word(s).
The article “Computing and Using Rural versus Urban Measures in Statistical Applications” discusses methods to measure the degree to which U.S. counties are urban rather than rural. The following frequency table presents population frequencies of U.S. counties. Populations are on the log2 scale; thus the first interval contains counties whose populations are at least 26 = 64 but less than 212.4 = 5404, and so on.
a. Construct a histogram from the frequency table.
b. Estimate the proportion of counties whose populations are greater than 100,000.
c. Is the histogram skewed to the left, skewed to the right, or approximately symmetric?
d. Construct a histogram using the actual populations rather than their logs. Why do you think the article transformed the populations to the log scale?