Mean of the sampling distribution of the sample mean
A certain type of IQ score has a mean of 106 and a standard deviation of 10. What would the mean of the sampling distribution of the sample mean if samples of size 89 were taken? Round your answer to three decimal places.
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In a random sample of five microwave ovens, the mean repair was $80.00 and the standard deviation was $11.50. Assume the variable is normally distributed and use a t-distribution to construct a 99% confidence interval for the population mean. What
A researcher determines that the probability of missing class among students at a local school is p = .16. Assuming that the school has 300 students enrolled, how many students can we expect to miss class on a given day? Hint: This is a binomial p
Suppose you open a new game at the county fair. When patrons win, you pay them $3.00; when patrons lose, they pay you $1.00. If the probability of a patron winning is p = .20, then how much can you expect to win (or lose) in the long run? Hint: Yo
An insurance company believes that their policyholders fall into two demographic profiles, A and B. The fraction of policyholders that are of demographic A is ? (with 0 < ? < 1) and the fraction of policyholders that are of demographic
A certain distribution X and Distribution Y have the same mean. Both distributions are symmetrical, but Distribution X is more variable than distribution Y. Given this information, we can correctly conclude that
A biased coin is flipped twice. There is a (5/9) probability that it will land heads on at least one of the two flips. What is the smalles number of times that I can flip the coin if I want to be at least 99% certain that the coin will land heads
A recent survey asked American adults how often they volunteered for charity. In the sample of 1,974 people, 51 said "more than once per week.
One manufacturer of aspirin claims that the proportion of headache sufferers who experience relief by taking only two pills is 0.53. If this claim is true,
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