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Suppose that the waiting time for a license plate renewal at a local office of a state motor vehicle department has been found to be normally distributed with a mean of 30 minutes and a standard deviation of 8 minutes. What is the probability that a randomly selected individual will have a waiting time between 15 and 45 minutes.
The cholesterol concentration in the yolks of each of a sample of 22 randomly selected eggs laid by free range chickens were found to have a mean value of 9.38 mg/g of yolk and a standard deviation of 1.62 mg/g.
An upper-level sociology class at a large urban university has 120 students, including 34 seniors, 57 juniors, 22 sophomores and 7 freshmen.
If a six appears for the second time, the process is repeated with the move depending on the number shown and the previous throws. If a six appears for the third time, the turn of the player ends without moving the token.
In a random sample of 800 customers selected for a short phone interview, 96 have stated that they have received their shipments late. The company's claim is that the percentage of late shipments is at or below 10%.
A new group comes along and that only has 5 people. Their weights are also measured initially and after 9 weeks. What would be the most accurate methodology for determining the percentage of weight loss for this new group?
Simplify each expression-Perimeter of a rectangle. The perimeter of a rectangular backyard is 6x+6 yards. If the width is x yards, find a binomial that represents the length.
Average length of trout caught in Swanson lake is u=19.For a random sample of 51 fish caught the mean length was xbar=18.5 inches with estimated standard deviation s=3.2 inches.
Find a 95% confidence interval for the difference between this year and last year in the mean number of units sold at all retail stores and interpret the results.
Let us suppose you have taken 100 samples of size 49 each from normally distributed population. Compute standard deviation of sample means if population's variance is 16. Area to left of ‘z' is 0.9976.
Given the following hypotheses: the true mean equals 100 (the null) and the true mean does not equal 100 (the alternate), a random sample of six resulted in the following values:
The standard deviation of grade points was 0.65 and the mean was 2.89. The standard error for the sample was
a) Under what circumstances can z be greater than one? b) Under what circumstances can a probability be greater than one?
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