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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)
Construct a 90 percent confidence interval for the true mean weight. Describe factors which might cause variation in the weight of Tootsie Rolls during manufacture.
Dr Johnson wants to know if there is sufficient evidence to conclude that the grade distribution of his class is different than the historical grade distribution.
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Probability that the entire batch will be rejected?
Use this information to construct a probability table, and then calculate each of the following probabilities:
Find out the finite population correction (FPC).With a population size of 1,000 and a planned sample size of 200, what is the finite population correction.
The hypotheses tested by the one-way ANOVA F test - Evaluate the P-value of the ANOVA F test
The number of customers at a specialty meat store averages about 1500/day. The exact number varies from day to day. On Fridays before long weekends, the number of customers increases to about 3000. Which of the following statements is correct
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Draw a tree diagram representing the data. What is the probability that a vehicle stolen in this city will never be recovered?
Suppose the assembly times follow normal distribution. Find out z values for 29 and 34 hours. What percent of garages take between 32 hours and 34 hours to erect?
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