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In response to concerns about nutritional contents of fast foods, McDonald's has proclaimed that it will use the new cooking oil for its french fries which will decrease substantially trans fatty acid levels and increase amount of more beneficial polyunsaturated fat. Company claims 97 out of 100 people can't detect difference in taste between new and old oils. Suppose that is figure is correct (as a long run proportion), determine the approximate probability that in random sample of 1000 individuals who have purchased fries at McDonald's:
a) At least 40 can taste difference between two oils?b) At most 5% can taste difference between two oils?
What is the probability that at most five cases of E. coli per 100,000 are reported in California this year?
The following data show samples of three chain stores in three different locations in one town and the amount of dollars spent per customer per visit. At the 0.05 level, is there a difference among the means?
The dean of the Western College of Business must plan the school's course offerings for the fall semester. Students demands make it necessary to offer at least 30 undergraduate and 20 graduate courses in the term. Faculty contract also dictate tha..
(a) State the hypothesis for a right-tailed test. (b) Obtain a test statistic and p-value assuming equal variances. Interpret these results. (c) Is the difference in mean scores large enough to be important?
On a test whose distribution is approximately normal with a mean of 50 and a standard deviation of 10, the results for three students were reported as follows:
An advantage of the permutation test over the t test for a difference in means, can Permutation tests be used for tests when we believe the two populations differ under the null hypothesis.
Find out a plausible value r for correlation between vehicle weight and miles per gallon (mpg) shown in the scattergram below?
You are given the following frequency distribution for the number of errors 55 students made in a test:
The weekly salaries of teachers in one state are normally distributed with mean of $490 and standard deviation of $45. Determine the probability that a randomly selected teacher earns more than $525 per week?
Healthcare issues are receiving much attention in both academic and political arenas. Compute the arithmetic mean age of the uninsured senior citizens to the nearest hundredth of a year.
For the 20 test scores shown, find the percentile rank for a score of 86.
Sketch a graph and shade the area of interest. SCores on a standardized exam are normally distributed with u = 60 and o = 5.
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