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What is meant by 'confidence level' and why is it different than 'confidence interval'? What is the difference between a 'point estimate' and a 'confidence interval'? When trying to estimate a population mean, when will we use a z-value based confidence interval? When do we use a t-value based confidence interval? What is a 'proportion'? How many students must we sample if we want to be within 4% of the true proportion of female students at DeVry University when using a 95% confidence interval?
At the .05 significance level, is the number of units produced on the afternoon shift larger?
A suburban hotel derives its gross income from its hotel and restaurant operations. The owners are interested in the relationship between the number of rooms occupied on a nightly basis and the revenue per day in the restaurant.
Random samples of 25 observations were selected from each of 3 populations. For these data, SSTR= 120 and SSE = 216.
Fast Service Truck Lines uses the Ford Super Duty F-750 exclusively. Management made a study of the maintenance costs and determined the number of miles traveled during the year followed the normal distribution. The mean of the distribution was 60..
The analysis of variances produces df between = 3 and df within = 24. For this analysis, determine df total ?
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?
A researcher obtains t = 4.00 and MD = 9 for a repeated-measures study. If the researcher measures effect size using the percentage of variance accounted for, what value will be obtained for r2?
What is approximately the largest sample mean of another sample of n= 16 participants you would expect to obtain from this finite population?
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.
A law student, who want to check a professor's claim that convicted embezzlers spend on average 12.3 months in jail, takes a random sample of 36 such cases from court files.
If alpha level is changed from a = 0.05 to a = 0.01. What occurs to boundaries for critical region?
Advertisers need to know which age groups are likely to see their ads. Purchasers of 120 copies of Cosmopolitan are shown by age group.
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