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You toss a fair coin 400 times. Us- ing the normal approximation, find the approximate probability of getting
1) exactly 200 heads;2) the number of heads that differs from the mean number of heads by at most 10;3) between 210 and 220 heads.
Each year approximately 160 colleges compete in national concrete canoe competion. Each team should design a seaworthy canoe from a substance not known for its capacity to float. T
A polling organization plans to sample 1000 adult Americans to estimate the proportion of Americans who think crime is a serious problem in this country. (a) What is the parameter of interest to the polling organization? (b) What will be the stati..
Finds that 3 contain errors. If the accountant's theory is correct, what is the probability that at least 3 invoices contain errors in a random sample of 10?
Given that a Brand A battery just failed, what is the expected value of the time we wait until the next Brand B failure?"
Ms. Maria Wilson is considering running for mayor of the town of Bear Gulch, Montana. Before completing the petitions, she decides to conduct a survey of voters in Bear Gulch. A sample of 400 voters reveals that 300 would support her in the Novemb..
The population of IQ scores forms a normal distribution with mean of μ = 100 and a standard deviation of σ = 15. What is the probability of obtaining a sample mean greater than M = 105,
What is the probability that Bob will win that wonderful trip on the basis of his gasoline sales this month?
The General Social Survey is an annual survey given to about 1500 U.S. adults selected at random. Each year, the survey contains several questions meant to probe respondents' views of employment.
Conduct the following test using 95% level of confidence.
The weights of dormitory cockroaches follow a normal distribution. 14% of the dormitory cockroaches weigh below 77 grams and 10% of them weigh above 82 grams. Find the mean and standard deviation of their weights.
What is the probability that the second pipe (with length Y) is more than 0.15 feet longer than the first pipe (with length X)? Give your answer to four decimal places. Hint: Do not use calculus to get your answer.
Let's suppose that we have 2 variables year and age.. I use STATA to make them into dummy variables as follows:
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