An oscilloscope's seconds/division switch is set on 20 ?s/cm. If the trace is 7.5 cm long, what is the period?

A) 0.0015 s B) 150 ?s C) 1.5 ?s D) 5 ?s


B

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A group of 78 people enrolled in a weight-loss program that involved adhering to a special diet and to adaily exercise program. After six months, their mean weight loss was 25 pounds, with a sample standard deviation of 9 pounds. A second group of 43 people went on the diet but didn’t exercise. After six months, their mean weight loss was 14 pounds, with a sample standard deviation of 7 pounds. Find a 95% confidence interval for the mean difference between the weight losses.

What will be an ideal response?

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Biting lice can serve as an intermediate host for tapeworms

A. True B. False

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On a winder stairway, the winder tread width at a point 12" from the narrower end of the winders must be

_____. a. at least 9" b. two-thirds the tread width in the straight portion of the stairway c. 10"-12" d. equal to the tread width in the straight portion of the stairway

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When a dimension is enclosed in parentheses, it indicates:

a. Mating dimensions b. Reference dimensions c. Chain dimensions d. Superfluous dimensions e. Local notes

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