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Scores on the SAT text are normally distributed with mean of 1518 and a standard deviation of 325. Scores on the ACT test are normally distributed with a mean of 21.1 and a standard deviation of 4.8. Assume that the two tests use different scales to measure the same aptitude. If someone gets a SAT score that is the 67th percentile, find the actual score and the equivalent ACT score
Last week Sarah had exams in Math and in Spanish. On the math exam, the mean was m = 40 with s = 5, and Sarah had a score of X = 45. On the Spanish exam, the mean was m = 60 with s = 8 and Sarah had a score of X = 68. For which class should Sara e..
Looking at the data, the manufacturer is incorrect in its label claim. Perform hypothesis testing to prove or disprove it. Is the manufacturer correct in its label claim? Explain.
An account invested in a money market fund grew from $73,329.23 to $73,627.26 in a month. What was the interest rate to the nearest tenth?
The amount of income spent on housing is an important component of the cost of living. The total costs of housing for homeowners might include mortgage payments, property taxes, and utility costs (water, heat, electricity).
A silver dollar is flipped 100times, with the following results: Heads =57, tails=43. What test should be used to determine if this is a fair coin?
Four brands of lightbulbs are being considered for use in the final assembly area of the Saturn plant in Spring Hill, Tennessee. The director of purchasing asked for samples of 100 from each manufacturer.
Draw a tree diagram representing the data. What is the probability that a vehicle stolen in this city will never be recovered?
Thirty-two samples of 8 items each were collected from a process. The average sample mean is 12 and the average range is 0.10. The upper and lower control limits, respectively, for an:
Carbon monoxide (CO) emissions for a certain kind of car vary mean 2.4 g/mi and standard deviation 0.7g/mi. A company has 60 of these cars in its fleet. Let y represent the mean CO level for the companies fleet. Estimate the probability that y is ..
State the appropriate hypotheses. Obtain a test statistic and p-value. Interpret the results at ? = .01. Is normality assured? Is the difference large enough to be important?
At.05 significance level, can we conclude that larger proportion of the agents think the economy is expanding this month?
Describe a psychological research situation or scenario that would use a nonparametric test. Why would the nonparametric test be used?
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