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The regulations of the board of health in a particular state specify that the fluoride level must not exceed 1.5 parts per million (ppm). The 25 measurements given here represent the fluoride levels for a sample of 25 days. Although fluoride levels are measured more than once per day, these data represent the early morning readings for the 25 days sampled.
.75 .86 .84 .85 .97 .94 .89 .84 .83
.89 .88 .78 .77 .76 .82 .72 .92 1.05
.94 .83 .81 .85 .97 .93 .79
(a) Determine the range of the measurements.
(b) Construct a frequency histogram by selecting appropriate number of class intervals.
(c) Compute relative frequencies for each class interval and construct a relative frequency histogram.
(d) If one of these 25 days were selected at random, what would be the chance (probability) that the fluoride reading would be greater than .90 ppm? [Guess (predict) what proportion of days in the coming year will have a fluoride reading greater than .90 ppm.]
what does p .05 mean? what are some misconceptions about the meaning of p .05? why are they wrong? should all
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