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The combined sat scores of students are normally distributed with a mean of 950 and a standard deviation of 200. nancy bright's sat score was 1390. what percentage of students have scores more than nancy bright?
An election poll reported that a candidate had an approval rating of 34% with a margin of error E of 2%. Construct a confidence interval for the proportion of adults who approve of the candidate.
With any statistical model, we assess the fit: Does the model accurately depict the truth? Explain how one of the following helps assess the "fitness" of the mean.
A sample of 49 provides a sample mean of 38 and a sample standard deviation of 7. Determine the standard error of the mean.
What are the mean and the standard deviations for the population of produced with this process?
Find a 95 percent confidence interval for the population mean concentration of uric acid in this patients blood. The concentration of uric acid in this patient's blood.
Body mass index is calculated by dividing a persons weight by the square of his or her height; it is a measure of the extent to which the individual is overweight.
Thirty-five sophomores, 37 juniors and 37 seniors are randomly selected from 247 sophomores, 413 juniors and 348 seniors at a certain high school. What sampling technique is used?
The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 inches and a standard deviation of 0.01 inches. What percentage of bolts will have a diameter greater than 0.32 inches?
Test the hypothesis that no difference exists between the groups at α = .05 and perform and report all related tests and statistics.
The national average for the price of a gallon of unleaded regular gas is $1.16. I believe the price is higher in my area of the country. I want to test my claim by randomly selecting gas prices for 25 stations in my area. The following prices are..
Sample resulted in mean trading volume = 39.48. Population standard deviation = 15.07. Compute 95% confidence interval for u.
Provide an example of a situation from your personal or professional experience where an two-sample test of hypothesis of dependent samples would be useful in a decision-making process.
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