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A lumber company is making boards that are 2767 millimeters tall. If the boards are too long they must be trimmed, and if they are too short they cannot be used. A sample of 37 boards is made, and it is found that they have a mean of 2763.3 millimeters with a standard deviation of 15. Is there evidence at the 0.05 level that the boards are too short and unusable?
State the null and alternative hypotheses for the above scenario.
(H0: , Ha: )
In a random sample of 34 quarterback 2012 season ratings, the sample mean was = 57.09. Is there any evidence to suggest that the true mean quarterback rating has increased? Use a = 0.05 and compute the p value.
Do women talk more than men? Equip male and female students with a small device that secretly records sound for arandom 30 seconds during each 12.5 minute interval for two days.
Suppose a point in two-dimensional Cartesian space, , is equally likely to fall anywhere on the semicircle. - Find the PDF of Y.
Find a 95% confidence interval for the mean of all drinks dispensed by this machine if a random sample of 36 drinks has an average content of 2.25 deciliters.
Suppose that 20 minutes are selected independently and weighted. Let Y equal the number of these mints that weigh less than 30 grams.
for r = 1, 2, 3, .... Also, use this recursion formula and the fact that μ0 = 1 and μ1 = 0 to find μ2,μ3, and μ4, and verify the formula given for α3 in Exercise 35.
Lucerne earns a gross income of $5,500 per month and applies for a mortgage with a monthly PITI of $1,244. Lucerne has other financial obligations totaling $829 per month. (Use the ratio guidelines from your text) What type of mortgage, if any, wo..
At the .05 level of significance, is there a difference in the mean number of months before a raise was granted among the four CPA firms?
To evaluate average annual expenses of students on books and class materials sample size 36 is taken.
5 patients qualify to have a surgical procedure performed. The doctor states that there is an 80% chance of a successful surgery.
For a normal population with u. = 80 and a = 20 which of the following samples is least likely to be obtained?
in an inertia welding experiment a sample of 50 welds were tested. the sample mean and sample standard deviation of the
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