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Revisiting the storage time study
We studied the loss of vitamin C when bread is stored in Exercise 7.76 (page 470). Recall that two loaves were measured immediately after baking and another two loaves were measured after three days of storage. These are very small sample sizes.
(a) Use Table E to ?nd the value that the ratio of variances would have to exceed for us to reject the null hypothesis (at the 5% level) that the standard deviations are equal. What does this suggest about the power of the test?
(b) Perform the test and state your conclusion.
an east coast manufacturer of printed circuit boards exposes all finished boards to an online automated verification
bookstores like education one reason being that educated peopleare more likely to spend money on books. national data
in a completely randomized experiment 6 experimental units were used for each of the 4 levels of the factor i.e. 4
a car manufacturer claims that the miles per gallon for a certain model has a mean equal to 40.5 miles with a standard
Independent random samples taken on two university campuses revealed the following information concerning the average amount of money spent on textbooks during the fall semester.
Suppose that Y has a continuous distribution with pdf f2, let Z=X+Y. Show that Z has a continuous distribution and find its pdf.
The total profit (in dollars) for sales of x rowing machines is given by P(x) = -0.2x^2 + 300x - 200. What is the profit if 500 are sold? For what value of x will the profit be at a maximum?
question the calculations for a factorial experiment involving four levels of factor a three levels of factor b and
The standard deviation of the population weight losses is about 10 pounds. How large a sample should he take to estimate the mean weight loss to within 2 pounds, with 95% confidence?
Draw a relative frequency histogram to describe the distribution of penny ages. How would you describe the shape of the distribution?
The shortlist consists of 7 men and 3 women. Because all the shortlisted applicants are considered to be equally qualified, the names of two of them are drawnn, one after the other at random, to be called for an interview.
the corrosive effects of various soils on coated and uncoated steel pipe was tested by using a dependent sampling plan.
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