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Here is a linear relationship between the duration x (in seconds) of an eruption of a geyser and the interval of time y (in minutes) until the next eruption. A least-squares regression line of data collected by a geologist is represented by, y-hat=41.9=0.18x, 100<x<300. What is the estimated increase in the interval of time until the next wruption that corresponds to an increase of 60 seconds in the duration?
Marie claims she can predict the sex of pregnant women's babies for first-time new mothers. She sees 1000 women a year, and she always predicts a female. She charges $1000 for a prediction
Can someone please break these problems down so that I can understand how to get the correct answer.
Use this information to construct a probability table, and then calculate each of the following probabilities:
It is impossible to obtain a standard error less than 2 for any sized sample.
The president of Doerman Distributors, Inc., believes that 30% of the firm's orders come from first-time customers. A random sample of 100 orders will be used to estimate the proportion of first-time customers. Assume that the president is correct..
Determine whether descriptive or inferential statistics have been used in the statement below:
Critically discuss why the dowload is a continous numerical varaible and critically discuss why the download time is a ratio scaled variable.
How much do typical employee and his or her family spends per year on dental expenses? Sample of 45 employee reveals mean amount spend last year was $1,820, with standard deviation of $ 660.
A psychologist has designed a questionnaire to measure individuals' aggressiveness. Assume that the scores on the questionnaire are normally distributed with a standard deviation of 80.
Use the population mean and standard deviation to find the z-score corresponding to 14.5%, the rate offered by the Bar Harbor Bank and Trust Company. Is this above or below the average?
Brain cancer is a rare disease. In any year there are about 3.1 cases per 100000 od population. Suppose a small medical insurance company has 150000 people on its books.
Assume that, among residents of a large Florida subdivision, the population mean age is 65 years old, the population standard deviation is 2 years, and that the age variable is distributed normally.
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