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A market research analyst for Apple Computer estimates that 48% of PC users have never used a Mac, and that by providing a hands-on experience the sales of Macs to PC owners can be increased.
To test the hypothesis that 48% of PC users have never used a Mac, the analyst took a sample of 50 PC customers drawn at random and found that 22 of them had never used a Mac.
Since over 10,000 students in his state took the Math SAT, he can show that the P-value for testing whether the mean score in his state is more than the national average of 480 is less than 0.0001. What we can conclude from this?
Determine the test sequence that minimizes the total expected cost of testing an item. Prove that your proposed sequence is optimal in minimizing the total expected cost of testing an item.
An insurance company sells $300 deductible annual automobile insurance policies to a certain category (age, driving records) for $1000.00 The insurance company has set four different accident types
Porphyrin is a pigment in blood protoplasm and other body fluids that is significant in body energy and storage. Let x be a random variable that represents the number of milligrams of porphyrin per deciliter of blood.
Teenage pregnancies. The U.S. National Center for Health Statistics reports for 2006 the distribution of teenage pregnancies by age range and ethnicity of the mother.
A firm plans to hire 100 employees during the year. It expects that 25 of these employees will obtain graduate degrees within the next 5 years of being hired. In addition, 35 employees will leave the firm within 5 years.
What is the probability that 25% or fewer male employees will indicate that they have to pick up the slack for moms working flextime?
What are the differences among a proportion, a percentage, and a ratio? When would a researcher use a hypothesis test for the difference in two population proportions? Explain.
At the 0.01 level of significance, is there evidence to support the professor's claim?
Sample resulted in mean trading volume = 39.48. Population standard deviation = 15.07. Compute 95% confidence interval for u.
Test whether there is difference in the proportion of viewers using Chi square test.
Chances to increase in value, decrease in value, or remain the same. Estimate the probability at least two of the stocks increase in value.
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