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A researcher is interested in the relationship between caffeine consumption and activity level for elementary school children. A sample of 20 children is obtained and the children are separated into two roughly equivalent groups. The children in one group are given a drink containing 300 mg of caffeine and the other group gets a group with no caffeine. The researcher then records the level of activity for each child during a 30-minute session on the playground. Is this an experimentalor a correlational study? Explain your answer.
Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15. Would it be unusual for the mean of a sample of 3 to be 115 or more? Why or why not?
Find the sample size for the 95% confidence interval used to estimate the population proportion.
Among coffee drinkers, men drink a mean of 3.2 cups per day with a standard deviation of 0.8 cups. assume the number of coffee drinks per day follows a normal distribution.
Compute a 3-month moving average forecast of demand for April through January (of the next year).
A portfolio manager believes that tomorrow's foreign exchange rate of German marks per US dollar will be Normally distributed with mean 2.03 and standard deviation 0.08. Using the manager's numbers:
Determine whether each of the distributions given below represents a probability distribution. Justify your answer.
The average number of hours of sleep per night that a college freshman gets is 6.50 with a standard deviation of 1.80 hours. If 35 college freshmen are randomly chosen find the probability that they average at least seven hours of sleep per night.
Examine the plot of the regression residuals against t. Is there a tendency for the residuals to have long positive and negative runs? To what do you attribute this phenomenon?
A) Resistant statistics should always be used. B) Resistant statistics should be used when the data is not bell-shaped. C) Sensitive statistics should be used when the data is not bell-shaped. D) Sensitive statistics should always be used. E) Resista..
This model is fit to the data using the method of least squares using statistical software, and the following parameter estimates and their standard errors are obtained.
Critically discuss why the dowload is a continous numerical varaible and critically discuss why the download time is a ratio scaled variable.
An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of two emails per hour.
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