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Q1) Random sample of 56 departing flights at the airport a 3-month period had mean wait of 14.2 minutes between boarding and takeoff, with standard deviation of 4.53 minutes. At same airport, random sample of 81 incoming flights over same 3-months period had the mean wait of 17.5 minutes between time that plane arrived at the gate and time that baggage reached the baggage claim area, with standard deviation of 9.87 minutes. At 0.05 level of significance, test the claim that at this airport mean wait for takeoff is less than mean wait for baggage
Q2) Suppose that population of heights of female college students is approximately normally distributed with mean m of 65 inches and standard deviation s of 2.75 inches. Random sample of 15 heights is obtained.
a) Explain distribution of x, height of the college student
b) Determine the proportion of female college students whose height is greater than 67 inches.
c) Explain the distribution of mean of samples of size 15.
d) Determine the mean and standard error of the distribution
e) Determine P (>67)
f) Determine P (< 64)
To determine if this is evidence that students perform worse under uncomfortable conditions, The P-value of a test
Solve the equations using linear algebra
In what sense is this business problem? A societal problem? An individual problem?
A company wants to know if minorities are more likely to be in certain job categories than others. Their data base codes employees 1 for clerical, 2 for custodial, and 3 for manager. A logistic equation was fit to the data with SPSS.
At.05 significance level is it reasonable to conclude that it takes longer to determination software issues? Determine the p-value?
Illustrate what was the lowest score earned on the exam. Explain how many students scored within 3 standard deviations of the mean.
What is the probability that there will be more than three trucks either being loaded or waiting?
At the 10% level of significance, is there sufficient evidence to indicate that more books are being loaned out per day, on the average?
Among 500 freshmen pursuing a business degree at a university, 347 are enrolled in an economics course, 204 are enrolled in a mathematics course, and 160 are enrolled in both an economics and a mathematics course.
Calculate descriptive statistics for each stock and the S&P 500. Comment on your results. Which stocks are the most volatile? Calculate the value of beta for each stock.
Assuming that students make their decisions independently, the number who accept has the B (1200, 0.75) distribution. If this number is less than 950, the college will admit students from its waiting list.
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
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