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On the standardized spatial skills task, normative data reveal that people typically, get µ= 15 correct solutions. A psychologist tests n = 7 individuals who have brain injuries in right cerebral hemisphere. For following data, find out whether or not right-hemisphere damage results in significantly decreased performance on spatial skills task. Test with alpha set at .05 with one tail. Data are given below: 12, 16, 9, 8, 10, 17, 10
A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that (a) both will fail? (b) Neither will fail? (c) One or the oth..
The demand for airplane passengers (Y) is a function of a average fare (X1), the fare of the competing airline, and the annual per capital income of the passengers(X3)
A rental agent claims that the mean monthly rent, mu, for apartments on the east side of town is less than $725. A random sample of 13 monthly rents for apartments on the east side has a mean of $724
It is estimated that 3% of the athletes competing in a large tournament are users of an illegal drug to enhance performance. The test for this drug is 90% accurate.
Determine the completion time and standard deviation (σ) for project roundoff the standard deviation to the nearest hundredth: two decimal places.
In studying the performance of the comapany's stock investments over the past year, the research manager of a mutual fund company finds that only 43% of the stocks returned more than the rate that had been expected at the beginning of the year.
Simulate a completely random process of length 48 with independent, t-distributed values each with 5 degrees of freedom. Construct the time series plot. Does it look "random" and nonnormal? Repeat this exercise several times with a new simulation ..
Determine the mean and variance for the number of Version 3 that someone would expect to get if they were to purchase 18 of the board games at random.
What is the 25th percentile of a chi squared distribution with 20 degrees of freedom? What symbol is used to denote this value?
When we say we have confidence level of 95% what do you believe our "margin of error" is?
Set up hypotheses to test if distribution of birthdays can be considered coming from uniform distribution.
In standardized form, the normal distribution a) Has a mean of 0 and a standard deviation of 1 b) Has a mean of 1 and a variance of 0 c) Has an area equal to 0.5 d) Cannot be used to approximate discrete probability distributions
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