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A random sample of 10 observations from one population revealed a sample mean of 23 and a sample deviation of 4. A random sample of 8 observations from another population revealed a sample mean of 26 and a sample standard deviation of 5. At the .05 significance level, is there a difference between the population means.
(a) Compute the pooled estimate of the population variance.
(b) Compute the test statistic.
(c) State the decision about the null hypothesis.
(d) Estimate the p-value.
To test whether there is any association between two variables using Chi-Square test for independence.
The U.S. Department of Transportation defines an airline flight as being "on-time" if it landed less than 15 minutes after the scheduled time shown in the carrier's Computerized Reservation System.
You are the designer for your company's web site. You have data to indicate that the mean download time for the homepage is 5.8 seconds and that the standard deviation of download time is 2.1 seconds.
Describe what assumptions must be met to use this test. Finally, where in your course project data set might you employ a paired t-Test?
Assume that the number of Telephone calls arriving in an office during a 15minute period has a Poisson distribution with mean number of calls equal 5.
If the player does not win or lose on his second roll he continues to roll, using the same criteria given for the second roll.
Explain in words general pattern of correlation is statistically important.
Construct the 90% and 99% confidence interval for population mean. Which interval is wider? If convenient, utilize technology to construct confidence intervals.
A recent study of breast cancer revealed that 13% of the women in the sample used antibiotics more than 500 days in their lifetime.
Set up hypotheses and carry out all relevant tests. Describe all results and implications which you have discovered.
What is the difference between a point estimate and an interval estimate? How would you calculate a confidence interval with a z test?
Playbill magazine reported that the mean annual household income of it's readers is $219,155. Assume this estimate of the mean annual household is based on a sample of 91 house-holds and based on past studies,
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