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Q1) Table illustrates the SAT verbal test scores for 9 randomly selected female students and 14 randomly selected male students. Suppose that sat verbal test scores are normally distributed. At a = 0.01, test claim that test score variance for females is different from that for males.
Female
480
610
340
630
520
690
540
Male
560
680
360
530
380
460
600
800
310
730
740
400
510
Q2) Steel pipe fittings company claims that yield strength of its nontempered couplings is more variable than that of its tempered couplings. Random sample of 9 tempered couplings has standard deviation of 13.1 megapascals, and similar sample of 9 nontempered couplings has standard deviation of 25.4 megapascals. From past data, it is recognized that company's production process results in normally distributed yield strengths. Test company's claim at a = 0.05.
If we fit the least-squares line to the 12 data points (one for each month) we obtain the following results from a software package. Notice that temperature is taken as the explanatory variable and crawling age as the response.
What is the approximate permutation test P-value and What is the permutation test P-value for testing the equality of the means versus the hypothesis that the mean change for the treatment group is larger than the mean treatment for the control gro..
How variable is the number of service calls with which Sam's department must deal?
At the .01 significance level, is there a relationship between job pressure and age?
Survey on What do you think is the biggest problem facing education today. One problem with exit polls may be that the wrong "key precincts" were chosen.
What is the probability that two of absent students were girls.What is the probability that two of absent students were boys.
prevent coronary artery vasoconstriction and the attendant reduction in blood flow to the heart and mechanical function.
A process is out of control when:
The ANOVA procedure is a statistical approach for determining whether or not:
As we can say there is 5.5 percent chance of seeing the current policy having an effect on smog in the results we observed from natural sampling variation.
The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals:
The choices are to be designated by the letter a, b, c, d, and e. The professor wishes to use a random-number table to determine which letter choice should correspond to the correct answer for a question. Using the number correspondence 1 for a, 2 fo..
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