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Use a calculator to verify that Σ(x) = 62, Σ(x2) = 1070, Σ(y) = 636, Σ(y2) = 90,510, and Σ(x y) = 9,497.
Compute r. (Enter a number. Round your answer to three decimal places.)
As x increases from 3 to 25 months, does the value of r imply that y should tend to increase or decrease? Explain your answer.
Forecast the future 5-year spot rate for the won (versus the dollar) using the Shoesmith Wave forecast and the forecast from the financial markets.
How long they stay on each visit. How would you suggest taking this sample? What type of sampling have you described?
U.S Census data show that 14% of the consumer population is 18 to 24 years old. Given the consumer is 18 to 24 years old, what is the probability that the consumer use a plastic card?
Studies of ‘‘intellectually gifted'' children have generally defined the lower limit of their IQ scores at 140; approximately 1% of the population have IQ scores above this limit. Find the standard deviation of this distribution.
in constructing a confidence interval for a mean with unknown variance with a sample of 25 items bob used z instead of
Use the Normal Curve applet. The 68-95-99.7 rule for Normal distributions is a useful approximation. You can use the Normal Curve applet on the text Web site
Find the probability that fewer than 5 are satisfied with the airlines. (c)Find the probability that 8 or more are satisfied with the airlines.
In a survey about soft drinks it was found that 5% of the respondents like diet soft drinks. 12% of the respondents like the brand Coke. Of the diet soda drinkers, 40% like Coke. What is the probability that a respondent did like diet drinks or di..
(a) What is the probability that the mean of the sample is 51,775 miles or less?
If the manufacturer guarantees the terminals for 3 years (and will replace them if they malfunction), what percentage of terminals will be replaced?
Why is a one-way ANOVA an appropriate statistical procedure for this scenario? Has the assumption of equal variances been met? Explain how you checked for this
Choose a group of 4 adults at random. What is the probability that none of them enjoy drinking beer?
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