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A biologist with the Department of Agriculture is studying the growth of artichokes. She knows that the number of artichokes produced by each plant follows a distribution which is approximately normal. She collects a sample of six plants and counts the number of artichokes produced by each plant. Here are her results:
32 17 51 40 36 34
Construct a 99% confidence interval for the mean number of artichokes produced by an artichoke plant.
Use a 0.05 significance level to test the claim that unfiltered king-size cigarettes have a mean tar content greater than that of filtered 100 mm cigarettes.
The city of Oakdale wishes to see if there is a linear relationship between the temperature and the amount of electricity used (in kilowatts).
Discuss whether this variable should be placed in the model as an ordinary quantitative variable or by means of four 0, 1 indicator variables.
Z score on comparison distribution for sample score and your conclusion. Suppose that all population are normally distributed.
The five year surival rate for Caucasians for all forms increased from 37% in 1960 to 58% now. Express this change in two ways (1) as an absolute difference in terms of percentage points and (2) as a relative difference in terms of percent.
Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15. Would it be unusual for the mean of a sample of 3 to be 115 or more? Why or why not?
If we know that 20 people will attend, what price should be charged per person to break even?
If F(x, y) is the value of the joint distribution function of the two continuous random variables X and Y a (x, y),
Assume that the height of adult caucasian women have a mean of 63.6 inches and a standard deviation of 2.5 inches. If 100 women are randomly selected find the probability that they have a mean height greater that 63.0 inches.
If absolute value of test statistic is less than critical value in hypothesis test decision is to?
What is the probability that an employee selected at random will need either corrective shoes or major dental work?
Using a 0.01 level of significance, test the claim that the tutoring has an effect on the math scores.
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