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Carry out the following operations.
a) Find out sample correlation coefficients of (I) age with dry weight, and (2) age with log 10 dry weight. Interpret your results.
b) For each straight-line regression, find out r2 directly by squaring r obtained in part (a); also determine r2 from computer output or from formula r2 (SSY - SSE)/SSY. Interpret your results.
c) Based on preceding results. Which of the two regression lines gives the better fit? Describe. Does this agree with your earlier conclusion?
We get the following for Y versus X
Now, for Z versus X we get
It is clear that second regression has much better linear fit. Actually, in the Y-versus-X model, 74.42% of variation is explained, whereas in the Z-versus-X model, 99.83% of variation is described.
For the data shown below, prepare a x-bar chart. Note that the sample size is three. Record the values for the UCL, center line, and LCL. In addition, note any points that are out of control.
A researcher was interested in determining whether incentives affect the response rate in surveys. A simple random sample of 50 adult residents of a large city was selected. All were mailed a survey and promised a check upon returning a completed ..
What are the expected value and variance of the following probability distribution?
Establish an approximate design to MTBF required for a system that will result in an approximate minimum total cost over a five year period if the system is to be operated 7500 hours per year
A year ago, Air Force implemented new test for finding which candidates are most probable to become successful pilots. Now they wish to see if implementing pilot predictor test was a good idea. Scores have been standardized to facilitate comparis..
By constructing null and alternative hypotheses, computing critical values, and comparing test statistic to critical value.
At a large department store, the amount a shopper spent and the shopper's gender (male or female) were recorded. To determine if gender is useful in explaining the amount of money a shopper spends at the store we could
Determine the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect?
Explain why random samples are preferred to nonrandom samples.
A review of voter registration records in a small town yielded the following table of the number of males and females registered as Democrat, Republican, or some other affiliation.
What is the sample space for this process and evaluate the variance of the intelligence scores
The p-value of the test is closest to:
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