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Q1) If you have multiple regression output with 2 independent variables and R-Square is .9682, what does R-Square indicate?
Q2) A researcher wishes to gather data about study habits of sophomores at Harmond University. From sophomore class of 2,300 students, she wishes to gather a sample of 70 students. Which of the given sampling methods will yield the most representative sample?
a) Randomly choosing 70 sophomores entering university's main library on arbitrarily selected evening.
b) Choosing 70 sophomores whose grade point averages (GPA) fall closest to mean GPA of the sophomore class.
c) Assigning each sophomore number and then arbitrarily generating 70 numbers from that list.
d) Arbitrarily choosing 70 sophomores who are members of college fraternities.
Let X be the number of correct guesses by your friend in the 100 trials and Use the Normal approximation with the continuity correction - Which of the following might be reasonably modeled by the binomial distribution
For following scores determine values of each expression: X: 4, 2, 1, & 5. åX, åX 2 , (åX) 2 , å(X-1).
What control limits should be applied to his sample?
The management of a department store is interested in estimating the difference between the mean credit purchases of customers using the store's credit card versus those customers using a national major credit card.
You have two unbiased estimates, e 1 and e 2 , of a quantity with variances V 1 and V 2 respectively, and covariance Cov {e1,e 2 } = C. Form a new unbiased estimate:
Evaluate z statistic for the Wilcoxon rank sum test, standard deviation for the Wilcoxon rank sum test and P-value for the Wilcoxon rank sum test
Assume that the smiling time of eight-week old babies, in seconds, follows a uniform distribution between 0 and 23 seconds, inclusive. This means that any smiling time from 0 to and including 23 seconds is equally likely.
Write the regression equation approximately. Computed the coefficient of determination(r 2 ).
Why is it misleading to draw the conclusion from the test above that long-time exposure to cadmium reduces the vital capacity?
Describe the factors that might cause variation in weight of Tootsie Rolls during manufacture.
Determine the 95% confidence interval for your estimate what data have you utilized as the basis of your predictions what suppositions have you made.
The probability of the patient being chosen at random as having meningitis as only site of infection is?
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