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Testing equality of two means.
An independent testing agency has been contracted to determine whether there is any difference in gasoline mileage output of two different gasolines used in the same model automobile. The first gasoline was tested on 200 cars and produced a sample average of 18.5 miles per gallon with a standard deviation of 4.6 miles per gallon. The second was tested on a sample of 100 cars and produced a sample average of 19.34 miles per gallon with a standard deviation of 5.2 miles per gallon. At the .05 level of significance, is there evidence of a difference in performance of the two gasolines?
Category of decision rule which contains maximax decision rule is?
Which of the following would have a binomial distribution and evaluate the binomial coefficient
Determine the mean and standard deviation of following probability distribution.
Be certain to mention the direction of the relationship, the strength of the relationship, and whether our findings are statistically significant
He measures the heights of 25 men from this century and finds the mean and standard deviation for his sample.
The estimated salary range is $4,500, the margin of error should be $100 and the desired level of confidence is 95%.
Find out the following probabilities. Probability that exactly 27 items will be good.
If a garage is robbed, what is the probability the doors were left open?
Suppose it costs $25 per student for the administrators to provide the course materials.
To forecast attendance at an yearly tennis tournament a model has been developed that uses attendance from the previous year and the amount spent for advertising this year.
When performing a chi-square test for independence, explain how the "cell frequencies under the independence assumption" are calculated.
First part of this theorem allows a problem solver to compute probabilities about sample means regardless of whether a population is normally distributed.
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