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A report states that 43% of home owners had a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 0.04 with 98% confidence?
For people with a certain disease, the length of time Y spent in remission is described by the following pdf
Discuss the factors which might cause variation in the weight of Tootsie Rolls during manufacture.
Normal distribution with mean 35 minutes and standard deviation 2 minutes. On 95% of occasions the mailing preparation takes less than _______ minutes.
Obtain a test statistic and p -value assuming equal variances. Interpret these results.
Among its various routes, a transit agency operates a trolley line. The line has a total of 18 trolley cars. Some of these cars are unavailable because they are being maintained or repaired.
Using the scatter diagram (no calculations), would you estimate the linear correlation coefficient to be positive, close to zero, or negative?
Explain and give examples of how the particular outcomes of a study can suggest if a particular threat is likely to have been present.
The χ 2 statistic from a contingency table with 6 rows and five columns will have:
Predict with 95% confidence the test score at a school where 50% of the mathematics teachers have mathematics degrees, the mean age is 43, and the mean annual income is $48,30.
A college would like to have an entering class of 1200 students. Because not all students who are offered admission accept, the college admits more than 1200 students.
What is the probability for the given frequency distribution?
Suppose that 47 showed reduced allergic reactions and 17 showed an increase in allergic reactions. Are these results sufficient to conclude that the self hypothesis has a significant effect.
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