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1. Given the following sample data:
x
420
610
625
500
400
450
550
650
480
565
y
2.80
3.60
3.75
3.00
2.50
2.70
3.50
3.90
2.95
3.30
a. Calculate the covariance and the correlation coefficient.
b. Comment on the relationship between X and Y.
c. Determine the least-squares regression line (Use Excel data analysis toolpak).
d. Draw the scatter diagram and plot the least-squares line.
2. A car dealer wants to find the relationship between the odometer reading and the selling price of used cars. A random sample of 100 cars is selected and the data are recorded in the Excel file XM18-03. Estimate a linear relationship between price and odometer reading. Calculate the standard error of estimate and describe what it tells you about the model fit. Find the coefficient of determination. What does this statistic tell you about the model?
The state of California has a mean annual rainfall of 27.6 inches, whereas the state of New York has a mean annual rainfall of 48.7 inches. Assume the standard deviation for California is 6.3 inches and for New York is 5.6 inches. Find the probabili..
Consider the following: Your friend wishes to know if men at his college are 72 inches tall, on average. He randomly sampled 10 men on his campus, measured their height, and calculated the sample mean to be 69 inches. He concluded that men at his col..
Find the area of the shaded region. The graph depicts the standard normal distribution of bone density scores with mean of 0 and standard deviation 1. The area of the shaded region is? z= -0.86 z .1.24 .round to four decimals.
Suppose that a random variable x has normal distribution with mean=80 and standard deviation=18. Calculate the following probabilities for the sample mean if the sample size is 36.
Please use QM for Windows to solve the problem given below. A multiple-server queuing system with an infinite calling population and a first-come, first-served queue discipline has the following arrival and service rates:
q1.what background information was provided about the health issue and why it is an issue?q2.what was the research
Estimate Carl's performance on the new machine.
A Gallup poll conducted during May 20 - 22, 2005, asked 1006 Americans, "During the past year, about how many books, either hardcover or paperback, did you read either all or part of the way through?" Results of the survey indicated that the me..
A particular district of your nation had a higher incidence rate for polio last year compared to the rest of the country. That region has been traditionally been resistant to vaccination efforts. You have commissioned a case-control study for the vil..
A group of 9 workers decide to send a delegation of 3 to their supervisor to discuss their grievances. If there are 4 women and 5 men in the group, how many delegations would include at least 1 woman?
Let p be the population proportion for the following condition. Find the point estimates for p and q. A study of 4728 adults from country A found that 2377 were obese or overweight. The point estimate for p, phat is ? The point estimate for q, q hat..
Determine the significance of the difference between the groups and determine whether building systems helped reduce new cases of malaria.
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