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Explain what problems arise in trying to make conclusions based on a survey mailed to the subscribers of a specialty magazine. Find or construct an example.
ICR questioned 1000 American male and female heads of household regarding their house cleaning attitudes. The survey has a margin of error of plus or minus 5%.
Soft Drinks a vending machine automatically pours soft drinks into cups. As the amount of soft drink dispensed into a cup is normally distributed
How many students should be surveyed if a 90% confidence interval is desired and the margin of error is to be only 3%?
A sample of 148 of our statistics students rated their level of admiration for Hilary Rodham Clinton on a scale of 1 to 7. The mean rating was 4.06 and the standard deviation was 1.70.
Conduct the most appropriate hypothesis test using a 0.05 significance level. Construct a 95% confidence interval for the true proportion of automobiles with drive trains that fail.
Probability based on addition rule - Find the probability that a randomly chosen sold automobile from this sample is silver or an SUV?
With a standard deviation of 9.87 minutes. At the 0.05 level of significance, test the claim that at this airport the mean wait for takeoff is less than the mean wait for baggage.
You are given the following frequency distribution for the number of errors 55 students made in a test:
Think about a real life situation that follows a linear equation, with the independent variable being years. What would the slope tell you about future years?
Write up a brief description of the problem with the conclusion drawn from the hypothesis test. Note that the problem is not in the calculations--assume the calculations are correct--but in the interpretation of the test.
Develop a forecast for year 6, using two-year moving average and trend analysis. Identify which method is most appropriate for this data set
What is the probability that at most five cases of E. coli per 100,000 are reported in California this year?
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