Confidence interval for the population variance
Given below are the values taken from a normal population.
21 23 25 27 28 35 30 32 33
Determine a 95% confidence interval for the population variance.
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Perform the four-step hypothesis test to determine if the training program increases scores?. What is the conclusion for the test at [Picture]
To test the hypothesis H0: ? = 100 vs. H1: ? > 100, a z-score of 2.8 is calculated. The probability of observing a z-score of 2.8 or one that is even larger, assuming the true mean is really equal to 100, is
The known population standard deviation for attendance on Tuesday evening is 550 and the known population standard deviation for attendance on Wednesday evening is 445. What is the appropriate decision given a 5% level of significance?
The manager assumes the waiting times to be normally distributed. Perform the four-step hypothesis test at the ? = 0.05
A researcher estimates the 95% CI for a sample with a mean of M = 3.26 and a standard error (?m) of 0.91. What is the upper confidence limit for this interval?
Write the event "the student could run a mile in less than 7.39 minutes" in terms of the value of the random variable Y. Use the symbols "<" or ">" as appropriate to indicate the bounds on Y.
Based on the sample results, can you conclude that there is a higher proportion of U.S. companies offering high-deductible health insurance plans to their workers in 2006 than in 2005? Construct a 95% confidence interval to answer.
An insurance company knows that in the entire population of millions of homeowners, the mean annual loss from fire is miu= $150 and the standard deviation of the loss is singama = $600.
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