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Samples of size 49 are taken from a population with a σ of 17. If the mean of the sample is 25, what is the confidence interval at the 90% confidence level?
If you had a research problem appropriate for ANOVA and it was based on the results from three samples, what would be the null hypothesis?
The Bee line Café is well known for its popular homemade ice cream, which it makes in a small plant in back of the café. People drive long distance to buy the ice cream.
They found that those with higher levels of cigarette use had lower GPAs, and vice versa. What can you rightfully conclude from this? Why? Be specific about what this kind of information may indicate and mean.
The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?
Consider the following continuously operation job shop. Inter arrival times of jobs are described as follows: What is the average time for the 10 new jobs?
What probability distribution does n1 alone have? Specify the values of the sample size index and parameter for that distribution.
Set-up/solve the problem graphically. (How many ceiling fans and how many floor fans should be made?)
Which test should we use to determine whether the difference between Mesa and Tempe is statistically significant? Why? Should it be one or two-tailed?
The 2009 National Assessment of Educational Progress (NAEP) gave a mathematics test to a random sample of eighth-graders in Texas. The mean score was 287 out of 500. To give a confidence interval for the mean score of all Texas eighth-graders, you..
Chi-square test for independence of attributes - Describe why a x 2 test of the resulting contingency table is appropriate for such an investigation.
You own a $46,000 portfolio comprised of four stocks. The values of stocks A, B, and C are $5,600, $16,700, and $11,400, respectively. What is the portfolio weight of stock D?
Find a 99% confidence interval for the difference in the mean number of calls between night and day.
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