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Assume that an ecologist is studying the effects of the insecticide DDT on wild birds in Sumatra. DDT sprayed on insects and vegetation subsequently eaten by female birds seems to affect the thickness of their eggshells and thus affects the protection of the embryonic birds. Assume the ecologist knows that the mean eggshell thickness in untreated birds (birds that have not eaten matter sprayed with DDT) is 330 microns and the variance is 2500 microns squared. Assume also that the thickness follow a normal distribution. The ecologist takes a sample of 16 eggshells and finds a sample mean of 290. The ecologist is interested in seeing if the spraying of DDT has any effect on the eggshells. (a = .05 ) a.) Ha: Ha: b.) Test statistic: c.) P-value: d.) Conclusion:
Think of your favorite casino game (craps, black-jack, roulette, etc) and analyze the probabilities of a few different outcomes.
a tried-and-true revenue stream for large cities has been the funds collected from parkingn meters. in a random sample
use your calculator or other software to conduct a test of the hypothesis that mu6 vs mult6 for the following data.
In a slow year, Deutsche Burgers will produce 2 million hamburgers at a total cost of $3.5 million. In a good year, it can produce 4 million hamburgers at a total cost of 4.5 million.
One set represents the weight before treatment. The other set represents the weight after treatment. In a case like this use a paired-sample t-test.
A t-test can be used to test the probability that the two means do not differ. The alternative is that the reaction times from the group treated with the drug will not be less than that from the control group.
The biggest inventory problem at the Barko facility is the storage of boom sections for their various Knuckleboom models. There are two types of boom sections: short and long. The following table outlines the demand in the next 5 months and the pr..
If she actually has 55% of the total vote, what is the probability of getting a sample proportion this small or smaller? Do you think she actually has 55% of the vote? Why or why not?
the mean per capita income is 17635 dollars per annum with a standard deviation of 891. what is the probability that
Let mi denote the mean number of shots needed for the ?rst hit when player i shoots ?rst, i = 1, 2. Also, let Pi , i = 1, 2, denote the probability that the ?rst hit is by player 1, when player i shoots ?rst.
The bombers success rates for bomber A, B and C are: 30%, 45% and 60% respectively. Find the probability that:Bomber A will succeed, but bomber B and C will fail.
More than 5 percentage points in either direction from what would have been got by interviewing all voters in United States." Determine sample size suggested by this statement.
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