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Tea Drinkers: A tea drinker's society estimates that the mean consumption of tea by a person in the United States is more than 7 gallons per year. In a sample of 100 people, you find that the mean consumption of tea is 7.8 gallons per year with a standard deviation of 2.67 gallons.At α=0.07 can you support the society's claim?
A mean score on a standardized test is 50 with a standard deviation of 10. Answer the following:
How many ships must be included in the sample if the CEO wants the error to be within 0.02 and a confidence level of 95% if: there is no information available that could be used as an estimate of the population proportion?
An airline has a policy of booking as many as 17 persons on an airplane that can seat only 16. Find the probability that if the airline books 17 people, not enough seats will be available.
What does the coefficient of determination tell you about the variation in attendance and the variation in the number of exhibitors?
The number of girls who attend a summer basketball camp has been recorded for the seven years the camp has been offered.
When only the value-added time is considered, the time it takes to build a laser printer is thought to be uniformly distributed between 8 and 15 hours.
A researcher has a series of Likert-scale items and a measure of frequency of absenteeism. He uses each of the Likert-scaled items in a separate bivariate correlation with absenteeism without testing for the assumptions of linear relationships. Is th..
The following data were obtained from an independent measures research study comparing three treatment conditions. Use an ANOVA with alpha=.05 to determine whether there are any significant mean differences among the treatments.
The 50 members of the placebo group had blood pressure lowered by an average of 15 points with standard deviation 8 points. To analyze this information we will use a, When testing whether or not the increases in spending are different, the test is ..
A 90% confidence interval runs from 65.891 to 70.109 for the mean daily number of credit card applications that are rejected from a computer system and must be handled manually.
An article in USA Today stated that "Internal surveys paid for by directory assistance providers show that even the most accurate companies give out wrong numbers 15% of the time."
Suppose an appliance manufacturer is doing a regression analysis,using quarterly time-series data, of the factors affecting its sales of appliances.
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