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The electronics store receives the shipment of 20 graphing calculators, comprising 3 that are defective. Four of calculators are selected to be sent to local high school. How many selections can be made using original shipment?
The athletic director claims that the atendance is the same as last year. What is the test value needed to evaluate the claim?
Florida State University administers a test of mathematics placement to students when they first enter the university.
Fresh fruit prices and quantity data for years 1988 to 2001 follow (Statistical Abstract of United States, 2002). Quantity data reflect per capita consumption in pounds and prices are per pound.
Find a 96% confidence interval for the true percentage of all households that have central air conditioning. Write a sentence that interprets this interval.
Construct a 99% confidence interval on the difference of the average ages for the viewers of the two TV programs. How can you interpret this interval?
What is the probability that a consumer buys a can whose contents are actually less than the stated weight of 16 oz.?
Conduct a hypothesis test using H 0 : σ 2 = .009216 to see whether the sample data indicate that the variability in interest rates changed.
Suppose we have the following information from a simple regression: What is the coefficient of determination? What is the correlation coefficient?
Construction of histogram and pie chart for continuous data
Let's treat race of offenders as the independent variable and race of victims as the dependent variable. If we first ignore the independent variable and try to predict race of victim, how many errors will we make?
Of the 500 surveyed, 350 said they would vote for the Democratic incumbent. Using the 0.99 confidence coefficient, what are the confidence limits for the proportion that plan to vote for the Democratic incumbent?
Consider the results of the hypothesis test you conducted above. Which of the two types of errors could you have committed? Explain the ramification of committing such an error in the context of this scenario.
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