During the 1930s, a large area of western Oklahoma and neighboring states became known as the:
a. dust bowl c. watershed
b. food chain d. grass waterway
A
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In theory, the system ground is considered to have a resistance of ____.
a. zero b. one c. ten d. infinity
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Indicate whether the statement is true or false
The accompanying data show spot speeds collected at a section of highway located in a residential area before and after an increase in speed enforcement activities. Using the student’s t test, determine whether there was a statistically significant difference in the average speeds at a significance level of ? = 0.05 (the 95% confidence level). Also report, for both the before and after cases, the mean speed, standard deviation, 85th percentile speed, and percentage of traffic exceeding the posted speed limit of 30 mi/h.
