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Below is a "sample" of 20 airfares (in Canadian dollars) to various destinations as advertised by Northwest Airlines during their spring sale. [Source: Globe and Mail, March 1, 1993] (Note: data values have been sorted below to help calculations)
49 59 69 89 89 89 99 99 99 109 109 109 119 119 149 149 149 149 149 169
(a) Test at a = 0.10 if the median airfare for Northwest Airlines' flights during the spring sale is below $120.
(b) What is there about this data that might invalidate your conclusion in (a)?
The heights of 40 randomly selected people and the heights of their mothers are recorded. Statdisk is used to run a linear correlation and regression analysis. The partial results are provided below:
Pearson correlation coefficient was 0.61.a. Was the correlation coefficient significantlydifferent from zero? Use α = 0.05.b. Predict the torque for a current equal to 50 mA.
Furthermore, in cases where the customer defaulted on the approved loan, the probability of receiving a favorable recommendation on the basis of the credit.
Out of n individual voters at an election, r vote Republican and n -r vote Democrat. At the next election the probability of a Republican switching.
Two distributions of data are being analyzed. Distribution A has a mean of 500 and a standard deviation equal to 100. Distribution B has a mean of 10.
The average age of the women was 45.582 with a standard deviation of 5.143. He uses this information to calculate a 95% confidence interval for the differnce in means, (-11.41, -5.422). The best interpretation of this interval is which of the foll..
you find a die on the street. it feels a little heavier than normal but you dont really think anything of it until you
Body mass index is measures at the ratio of weight in kilograms to height in meters squared. Generate a 95% confidence interval estimate of the true BMI. 25 27 31 33 26 28 38 41 24 32 35 40.
The file chicago.txt contains daily average receipts per theater for the movie Chicago (January 3. 2003 to April IS. 2003). Analyze the data set using time series methods. This series may have a trend as well as seasonality (day of the week).
A student suggests asking each student to flip a coin, and if the coin comes up heads, then he or she is in your sample. Explain why this is not a good method.
The average cost of repairing a VCR is $80 with a standard deviation of 19. if one VCR is repaired, find the probability the cost is between 70 and 90.
A certain type of lightbulb has an average life of 500 hours with a standard deviation of 100 hours. The length of life of the bulb can be closely approximated by a normal curve.
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