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Suppose that 51% of the population of U.S. voters favors a particular candidate. If a random sample of 40 voters is chosen, approx. the probability that more than 20 favor this candidate. Use the normal approximation to the binomial with a correction for continuity.
What is the 99% confidence interval, if the population standard deviation is known to be 10 days? What is the 99% confidence interval, if the sample standard deviation is 10 days?
A researcher predicts that watching a film on institutionalization will change students' attitudes about chronically mentally ill patients.
Consider a gambler who at each play of the game has probability of winning one unit and probability of loosing one unit. Assuming that the successive plays of the game are independent,
A statistic practitioner working for Major League Baseball determined the probability that the hitter will be out on ground balls is .75. in a game where there are 20 ground balls, find the probability that all of them were out.
Suppose that a researcher does a study to see how level of anxiety (A 1 = low, A 2 = medium, A 3 = high) is used to predict exam performance (Y).
The average monthly gasoline purchase for a family with 2 cars is 90 gallons. This statistic has a normal distribution with a standard deviation of 10 gallons. A family is chosen at random.
You are given the following frequency distribution for the number of errors 55 students made in a test:
Use Hypothesis Testing and the data in the course materials folder to analyze the difference in milk production in California. Formulate both a numerical and verbal hypothesis statement regarding your research issue.
Create a stem-and-leaf display of these data. Create a box plot of these data.
Give an ending for the below statement.Last week Tom had exams in Statistics and in English. He scored 10 points above the mean on both exams. From this information, you can conclude.
Please use synthetic division and the remainder theorem to find the indicated function values:
Sample mean = $40,000, sample standard deviation =$1500 and n= 25. Assume that the population from which the sample is drawn is normally distributed.
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