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A chi-square test for goodness of fit is used to examine the distribution of individuals across three categories, and a chi-square test for independence is used to examine the distribution of individuals in a 2´3 matrix of categories. Which test has the larger value for df?
when an opinion poll calls residential telephone numbers at random only 20 of the calls reach a live person. you watch
A researcher with Ministry of Transportation is commissioned to study the drive times to work (one-way) for U.S. cities. The underlying hypothesis is that average commute times are different across cities.
The distribution of sample means? Compute the z-score for M=89 for a sample of n=25 scores. Is this sample mean in the middle 95% of the distribution?
An insurance company looks at the records for millions of homeowners and sees that the mean loss from ?re in a year is μ = $300 per person.
Solve each system of equations using matrices(row operations). Have to see step by step of what is going on.
Supposing that both tests measure the same kind of ability, who has the higher score? If grading were done on a curve, what would their respective percentages be?
Assume a linear relationship, use the least square method to find the regression coefficients bo and b1 and Predict the mean kilowatt usage when the average temperature is 50 degrees Fahrenheit.
The probability of a 1 on the first toss is 1/6. What is the probability that the first toss is not a 1 and the second toss is a 1?
What is the probability that a randomly selected eagle's wingspan is exactly 77 inches? Explain your answer. What is the probability that a randomly selected eagle's wingspan is 77 inches or less?
In an evaluation of the medical lab, the manager is interested in the efficiency of three technicians when they process four routine blood tests.
In relative frequency histogram for a large set of GPAs, the mean and the standard deviation are 2.10 and 0.21 respectively. What proportion of GPAs falls within 1.68 and 2.52?
the average age of amtrak passenger train cars is 19.4 years. if the distribution of ages is normal and 24 of the cars
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