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According to an article in the New York Times, new Internet dating Web sites use sex to advertise their services. One such site, True.com, reportedly received an average of 3.8 million visitors per month.
Suppose that you want to disprove this claim, believing the actual average is lower, and your random sample of 15 months revealed a sample mean of 2.1 million visits and a standard deviation of 1.2 million. Conduct the test using α = 0.05. What is the approximate p-value?
The following are 30-day Euroyen prices on an index from 0 to 100%: 99.24, 99.37, 98.33, 98.91, 98.51, 99.38, 99.71, 99.21, 98.63, 99.10. Find µ, σ, σ2, and the median.
How many months had no days with 0.5 inches or more of precipitation? What proportion of months had no days with 0.5 inches or more of precipitation? Construct a 95% confidence interval for the proportion of months that had no days with 0.5 inches..
Each student in an experiment was told to look at 100 cars and count the number of people wearing the seat belts. The mean score for the class was found to be 44, and standard deviation =7
a researcher uses analysis of variance to test for mean differences among four treatments with a sample of n 8 in each
a. What are the values of the design parameters, t, k, b, r? b. What is the value of l for this design? c. Is the incomplete block design balanced? Justify your answer.
What percentage of the high temperatures are within the interval x‾ - S to x‾ + S? How do these percentages compare to the corresponding percentages for a normal distribution (68.26% and 95.44%, respectively)?
Using the spreadsheet for exercises 1-3, estimate how the population will change from this generation to the next under each of the following conditions.
in a sample of 1000 people 540 are in favor of candidate a and the rest are in favor of candidate b. find the 95
Their average cost was $405 with a standard deviation of $80. The Dean of Students believes that the costs are greater this semester. What is the test value for this hypothesis?
test the claim that the population of kindergarden students has a mean grade point average of 2.25 versus a mean grade
The reinvestment rate for these funds is 3 percent. Anderson uses an 13 percent required return on this project. what is the NPV?
What is the probability that 10 or more were male? What is the probability that 10 or more were female? What is the probability that fewer than 7 were female?
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