The wildlife department has been feeding a special food to rainbow trout fingerlings in a pond. A sample of the weights of 40 trout revealed that the mean weight is 402.7 grams and the standard deviation 8.8 grams. What is the point estimate?
Answer(s): E
The sample mean is a good estimate for the population mean.
Given the following points: (-2, 0), (-1,0), (1, 1) and (2, 3) If the regression equation is Y' = 2 - .4X, what is the value of Y when X = -3?
Answer(s): B
Y' = 2 - 0.4*(-3) = 2 + 1.2 = 3.2
What must you know to develop a binomial probability distribution?
Binomial distribution: n!(p^r)(q^(n-r))/r!(n-r)!. We need to know n and p. q = 1-p. r is the number of successes which we determine ourselves.
The weights of a sample of crates ready for shipment to Laos are (in kilograms): 103, 97, 101, 106 and 103.What is the mean deviation?
Answer(s): A
The mean is 102. The mean deviation is the absolute values of the deviation from the mean. (1 + 5 + 1 + 4 +1)/5 = 12/5 = 2.4
What is the distribution with a mean of 0 and a standard deviation of 1 called?
These values describe the standard normal distribution.
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