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Refer to the situation of problem 8-72. The study also compared average portfolios of microloans. For the Alpha group it was $50 million, and for the Beta group it was $14 million.
Assume the Alpha group had a standard deviation of $20 million and the Beta group had a standard deviation of $8 million. Construct a 95% confi- dence interval for the difference in mean portfolio size for firms in the two groups of credit ratings.
With a standard deviation of 1.7 grams. Assuming the distribution of weights is normally distributed, 4% of whooping crane eggs weigh less than how many grams?
an independent-measures research study uses two samples each with n 12 participants. if the data produce a t statistic
A man is in the process of buying a new car. He has a choice of 3 engine makes, 7 body styles and 10 colors. How many different cars does he have to choose from?
What crimes were most commonly committed on Minnesota campuses between 2009 and 2011? Based on the data, would you say the crime rates decreased or increased from 2009 to 2011?
Using the .05 level of significance: a) Is there a difference among types of gasoline? b) Is there a difference in the cars?
What is the probability that a 400-square-foot painted section will have fewer than 6 blemishes? What is the probability that six randomly sampled sections of size 400 square feet will each have 7 or fewer blemishes?
The standard deviation of the scores is probably close to the value 0.78 for the adult male population. How large an SRS of hotel managers do you need?
Construct a 95% confidence interval estimate for the population mean turnover time. Interpret the interval constructed in (a). Do you think the quality improvement project was a success?
In a batch of 8,000 clock radios 9% are defective. A sample of 15 clock radios is randomly selected without replacement from the 8,000 and tested.
Using the quadratic equation x2 - 4x - 5 = 0, perform the following assignment Solve by factoring and solve by using the quadratic formula
Students enrolled in a particular course are preparing for an exam that will consist of 25 multiple choice questions, each of which has five possible answers.
the ages and heights of a sample of child smokers were taken. the average age was 13.5 years with an sd of 2.3 years.
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