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The owner of a gasoline service station wants to study gasoline-purchasing habits by motorists at his station. A random sample of 60 motorists during a certain week is selected with following results. Amount purchased = 11.3 liters, S = 3.1 liters 11 motorists purchased super unleaded gasoline
(1) At the 0.05 level of significance, is there evidence that the average purchase is different from 10 liters?(2)At the 0.05 level of significance, is there evidence that less than 20% of the motorists purchase super unleaded gasoline?
r. Patton is a professor of English. Recently she counted the number of misspelled words in a group of student essays. She noted the distribution of misspelled words per essay followed the normal distribution with a standard deviation of 2.44 word..
The display represents Excel output for an ANOVA analysis with σ = 0.05.
An EMT Service keeps records of emergency calls. A study of 150 five-minute time intervals resulted in the distribution of number of calls as follows.
What is the correlation between student cumulative GPA and the numbers of hours spent on school work each week? Be sure to include the computations.
Two popular over-the-counter antacids are compared to determine which brand is preferred. Three hundred subjects are randomly selected then divided into two groups of 150 each, and given one of the two antacids.
Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probability formula to find the probability of x successes given the probability p of success on a single trial.
What is the Chi-square test? Where can you apply it? Please site an example of how it was used and the outcome of the test. I think this could help me better than the book, it is difficult to understand.
For every additional hour spent studying for the exam you would expect a grade improvement of 60.2 points
A study to see how well marital dissolution was predicted by the personality scores of husbands and wives was published in the Journal of Personality and Social Psychology.
At.01 significance level is it sensible to conclude that modification decreased the number of traffic accidents?
Random samples of five hundred units that were selected daily from a manufacturing process produced an overall defective rate of 3.5%. Calculate the lower and upper control limits for a percentage control chart.
If absolute value of test statistic is less than critical value in hypothesis test decision is to?
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