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1. Explain the difference between a population and a sample. Give five examples.
2. A grocery store sells an average of 478 loaves of bread each week. Sales (X) are normally distributed with a standard deviation of 17.
(a) If a random sample of size n = 1 (week) is drawn, what is the probability that the X value will exceed 495?
(b) If a random sample of size n = 4 (weeks) is drawn, what is the probability that the X value will exceed 495?
(c) Why does your response in part (a) differ from that in part (b)?
Let f be a Borel measurable function from a separable metric space X onto a metric space S with metric e. Show that (S, e) is separable.
In a sample of 500 college students aged 18 to 21, it was found that offering discount coupons for restaurant meals substantially increased the likelihood that the students would eat at those restaurants. Explain how "extending results inappropria..
In a sample of 300 persons to whom materials were sent, 30 students applied for admission. In a two-tail test at the 0.05 level of significance, should we reject the director's claim?
a. How many variables are there in this study? What are the levels of any variable you identified? b. What hypothesis test would be used to analyze these data?
Use the Correlation and Regression applet to create your own exercise to explore how the least-squares line behaves when points are moved.
Total housing costs as a percent of monthly income, five years ago and now. The information is reported below. Is it reasonable to conclude the percent is less now than five years ago?
Killing weeds A biologist would like to determine which of two brands of weed killer, X or Y, is less likely to harm the plants in a garden at the university.
a publisher wants to estimate the mean length of time in minutes all adults spend reading newspapers online. to
the following sample of heights was taken from 7 cans off the assembly line12.9 12.9 12.8 12.9 13.4 13.2 12.6build a 90
Researchers at the University of Washington and Harvard University analyzed records of breast cancer screening and diagnostic evaluations
psychologist believe that memory of pictures is superior to memory for words. to test this hypothesis the psychologist
Suppose that events occur in accordance with a Poisson process al the rate of i five events per hour.
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