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Almost all medical schools in the United States require students to take the Medical College Admission Test (MCAT). To estimate the mean score μ of those who took the MCAT on your campus, you will obtain the scores of an SRS of students. The scores follow a Normal distribution, and from published information you know that the standard deviation is 6.1. Suppose that (unknown to you) the mean score of those taking the MCAT on your campus is 25.0.
an economist wants to know whether these two variables the help wanted index and the unemployment rate among insured
the mean annual salary for chauffeurs is 21000. a random sample of size 45 is drawn from this population. assume that
Assume that, on average, 95% of all ticket holders show up for a flight. If a plane seats 200 people, how many tickets should be sold to make the chance.
Find the sample proportions and test statistic for equal proportions. Is the decision close? Find the p-value.
the standard deviation is $400. Suppose 90 claims are filed in one week. What is the probability that the average (sample mean) is more than $1900?
Compute chi-square and test that the proportion of smokers is the same among cases and controls for (a) and (b). Is the chi-square the same if the number of controls is doubled?
As the denial or perversion of justice by the sentences of courts, as well as in any other manner, is with reason classed among the just causes of war.
Using Return Distributions. Suppose the returns on long-term government bonds are normally distributed. Based on the historical record.
Three cards are randomly selected from an ordinary deck of cards without replacement Compute the probability that the first card is a spade given that the second and third are spades.
A stationery store to estimate the mean retail value of greeting cards purchased by its customers when they visit the store. A random sample of 15 customers indicates a mean amount of $2.55 with a standard deviation of $0.44 per customer per visi..
Should Martha use an independent-samples t-test or a related samples t-test? Explain your answer.
Quality control. A consumer organization estimates that 29% of new cars have a cosmetic defect, such as a scratch or a dent, when they are delivered to car.
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