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Estimating the confidence interval for population mean.
The Superintendent wants to determine the average amount of hours per week the student population studies at home. Took the exam now. A study is conducted and the results are as follows: n = 25, = 6, σX = 1. Find a 90% confidence interval for µX.a) (5.9342, 6.0658)b) (5.8529, 6.1471)c) (5.608, 6.392)d) (5.671, 6.329)
The American Automobile Association checks the prices of gasoline before many holiday weekends.
Find a 95% confidence interval for the mean µ of the population from which the men were selected.
Assume your statistics professor reports test grades as z-scores, and you got a score of 2.20 on the midterm exam. Write down a sentence explaining what that means.
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
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
The 'interaction effect' was also important. By using the means in the table above write a statement explaining how the anti-anxiety drug appears to affect anxiety. Are the outcomes consistent with the hypothesis proposed by the researchers?
I want to establish if a new product is worth marketing. At least 85 percent of the public must express interest in the product and for those that do the average cost they are willing to pay must be at least $47.50.
P-value to test hypotheses,
Calculate the appropriate test statistic to test the hypotheses related to the concern and test at 5% and 1%.
If the estimate is to be within 8 mpg of the true mean with 98% confidence and the estimated standard deviation is 22 mph, how large a sample size must be taken?
The p-value of the test is closest to:
Estimate the population mean
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