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The average American male wears a size 10 shoe and spends 4 hours a year tying a tie. The average American female college student owns 3.5 pairs of jeans. The average American laughs 15 times daily, swallows 215 aspirin tablets a year, and has a dog weighing 32 pounds.
a. Select one of these estimates. How do you suppose it was derived?
b. What sampling method would you use to update each of these statistics? What problems would you anticipate?
c. Could a census be used?
d. Are the populations finite or infinite?
Make a relative frequency histogram by using ten-point intervals to show the distribution of the scores.
The systolic blood pressure of a group of 18-year-old women is basically distributed with a mean of 120 mmHg and a standard deviation of 12 mmHg.
The following frequency table summarizes the ages of 100 shoppers at the local grocery store. Compute the sample variance and standard deviation for this data set. Please show your work in Excel.
A market researcher is interested in knowing the type of training that works best for DVD users. Thirty consumers are randomly selected from a population of known DVD owners (i.e., users).
From a random sample we know that the average duration of unemployment in a low developed region A is 147 days (with standard deviation sA = 32 days and nA = 230 unemployed).
Determine the chance between 39% and 41% of registered voters in sample are Democrats.
Critically discuss the concept of the normal distribution, why it is important, and what you think it means. When students talk about "grading on the curve," how does that apply to the normal distribution?
The demand, D, on any given day is uniformly distributed over [80,140]. How many units should the retailer order to maximize expected profit?
At the 5% level of significance, can we infer that branch A has a significantly higher proportion of satisfied customers than branch B?
By using the age midpoints x and the percentages of nurses, do we have a valid probability distribution? Describe.
The difference between expected payoff under certainity and expected value of the best act without certainity is the expected:
It took a contractor 5000 hours to manufacture their first unit of an item. If the contractor expects to achieve a 94% unit learning curve, how many hours would be required to manufacture units 76-100?
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