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A 2003 NY times/CBS news poll sampled 523 adults who were planning a vacation during the next six months and found that 141 were expecting to travel by airplane. A similar survey question in a may 1993 NY times/CBS news poll found that of 477 adults who were planning a vacation in the next six months, 81 were expecting to travel by airplane.
a. State the hypotheses that can be used to determine whether a significant change occurred in the population proportion planning to travel by airplane over the 10-year period.
b. What is the sample proportion expecting to travel by airplane in 2003? In 1993?
c. Use α =.01 and test for a significant difference. What is your conclusion?
d. Discuss reasons that might provide an explanation for this conclusion.
Key Refining decided to send a special financing plan to charge account customers having the highest 10 percent of the money charges. What is the dividing point between customers who receive the special plan and those who do not.
Make use of Excel to determine the right-tail p-value.
Use either Linear Programming module or Transportation module of Cd to minimize the shipping costs involved in move.
Internal study by Technology Services department at Lahey Electronics disclosed company employees get the average of 2 emails per hour. Suppose arrival of these emails is approximated by Poisson distribution.
prevent coronary artery vasoconstriction and the attendant reduction in blood flow to the heart and mechanical function.
Compute the score based on their appropriate class means and standard deviations:
First explain what the Gini coefficient is and what hypothetical Gini values of 0 and 1 mean. Sort the data by the Gini coefficient in 2000 and look at the list of countries.
What is the probability that they all hit the target?
Advertisers need to know which age groups are likely to see their ads. Purchasers of 120 copies of Cosmopolitan are shown by age group Perform the chi-square test for a uniform distribution at α = .01
By using the fact that Martha believes the treatment will decrease the amount of time to fall asleep, describe the null and alternate hypotheses.
Use suitable one or two sided test for null hypothesis of no difference in them then changes rating between groups at 0.10 significance level.
You will investigate four different scenarios of population growth also decline in this town. Graph the model as well as investigate it by four different growth models.
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