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The Graduate Record Exam (GRE) is used to predict performance of applicants in graduate school. The scores range from 200 to 900. If the scores are approximately normal with mean 544 and standard deviation 103, what minimum score would a student need in order to score in the top 10% of those taking the test?
The value of "Z" chosen for constructing (calculating) the confidence interval estimate is determined by
The types kinds of statistical information collected in your professional setting. Provide examples to illustrate the information/data.
Make three-month and four-month moving averages for this time series. Does the three-month or four month moving average provide the better forecast? Explain.
The mean number of hours of flying time for pilots at Continental Airlines is 49 hours per month (The Wall Street Journal, February 25, 2003).
Furthermore, assume that the standard deviation of the population is $0.14. The value of the test statistic for this hypothesis test and the p-value respectively are?
How could the engineer increase the accuracy of the interval without changing the level of confidence?
If the population mean for how much alumni spend is $115.50 per week eating out socially, what is the mean and standard deviation for the sampling distribution of x?
What is the probability of a type 1 error in this situation? What does it mean?
How might you go about creating a stronger regression model? For example, you have a multiple regression model with an adjusted R-Square of 0.49, which would explain 49% of the variance of the dependent measure
A particular candidate claims she has the support of at least 60% of the voters in her district. A random sample of 150 voters yields 87 who support her.
On weekdays there is an average of four customers waiting in line. What is the probability that you visit Safeway today during this period and find: No customers are waiting?
Body mass index is measures at the ratio of weight in kilograms to height in meters squared. Generate a 95% confidence interval estimate of the true BMI. 25 27 31 33 26 28 38 41 24 32 35 40.
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