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Question: Frogs, part II. Based on concerns raised by his preliminary research, the biologist in Exercise 28 decides to collect and examine 150 frogs.
a) Assuming the frequency of the trait is still 1 in 8, determine the mean and standard deviation of the number of frogs with the trait he should expect to find in his sample.
b) Verify that he can use a Normal model to approximate the distribution of the number of frogs with the trait.
c) He found the trait in 22 of his frogs. Do you think this proves that the trait has become more common? Explain.
Discuss the relationship between the mean and median for distributions that are symmetrical and skewed.- Why is the range not as useful a measure of dispersion as the standard deviation?
Find the mean and the standard deviation of the sampling distribution of -x and find the interval containing 95.44% of all possible sample means returns.
events a and b are mutually exclusive. suppose event a occurs with probability 0.29 and event b occurs with probability
fifty percent of the people that get mail-order catalogs order something. find the probability that only four of the 10
The sums of squares were computed as SSW = 4773.3 and SSA = 591.2. Use the F test of ANOVA (assume α = 0.05) to decide whether or not there are any differences in true average lumen outputs between the three brands for this type of light bulb.
President Harry Truman says, "There's another kind of cruelty: indifference." What does he mean? Do you agree?
Die with 4 sides {1, 2, 3, 4} is tossed 2 times. Let X equal maximum of two observations and let Y equal minimum. Determine joint pmf of X and Y, and correlation coefficient. Are X and Y independent?
For each of the following situations, state whether the distribution of interest is a z distribution, a t distribution, or an F distribution.
are 14 of mampm candies yellow? mars claims that 14 of its plained candies are yellow and a sample of 100 such candies
A local fast-food restaurant has determined that 10% of drive-thru orders are filled incorrectly. Suppose 5 orders are randomly selected. What is the probability that more than one of the orders is filled incorrectly?
What is Pangea? Approximately when did it split apart and form the land masses that we recognize today as North, Central, and South America?
a research engineer for a tire manufacturer is investigating tire life for a new rubber compound and has built 16 tires
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