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In order to estimate the mean amount of time computer users spend on the internet each month, how many computer users must be surveyed in order to be 90% confident that your sample mean is within 12 minutes of the population mean? Assume that the standard deviation of the population of monthly time spent on the internet is 219 minutes. What is a major obstacle of getting a good estimate of the population mean? Use technology to find the estimated minimum required sample size.
Two impendent samples of signs 9 and 8 gave the sum of squares of deviation from their respective means as 160 and 91 can the samples be regarded as drawn from the normal population with equal variance
Suppose a new weight loss program was sponsored by the local health and fitness club in a small town. The program claims to make people lose more than five pounds in a month. Twelve participants were selected and their weights were recorded.
equation of the regression line.using the age and sick days data age x182639485358sick daysy16129562anbsp find the
Under what circumstances must a nonparametric test be used? Explain. What are the strengths and weaknesses of nonparametric tests?
Descriptive statistic results from quarterly sales figures over a 18 year period (73 qtr) are below. Please interpret the standard Deviation and Median in terms of sales results,
Solve the problem using the graphical solution procedure. Find out the optimal percentage allocations and the optimal total portfolio return
Can you can tell the difference between coke and pepsi in a blind taste test? Most people say they can and have a preference for one brand or another.
To find the 95 percent confidence interval for the true population mean. From the results below, is it true that 95% of the sample means will fall
The changing ecology of the swamps in Louisiana has been the subject of much environmental research. One water-quality parameter of concern is the total phosphorous level.
How can we be certain that surveys and statistics that we hear about in the media are accurate samples and unbiased? Is there a way to dissect the information and determine if a probability sample was used?
A sociologist claims that the success of students in college (measured by their GPA) is related to their family's income. For a sample of 20 students, the coefficient of correlation is 0.40. Using the 0.01 significance level
Consider how you might apply radical expressions to your daily life. Explain this application, and discuss what the equation might be.
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