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Over the last 100 years, prior to 2005 the average /maximum temperature on February 1 was 27.6 degrees Fahrenheit. The standard deviation was 5.7. Over the same period the average /maximum temperature in Dublin was 6.2 degrees Centigrade. The standard deviation was 2.9.
1. How to compute the variance of temperature in Boston.
2. Need to figure out what the units are that are associated with the standard deviation of temperature in Boston.
3. Need to find out Need what the units are that are associated with the variance of temperature in Boston.
and Lastly,
4. In 2005 the maximum temperature on February 1 was 35 in Boston and 10 in Dublin. Need to explain which one of theses 2 temperatures was more extreme relative to past experience on that date.
Construct a 99% confidence interval estimate for the population mean amount of paint included in a 1-gallon can.
Suppose you compute a simple linear regression on a single sample. Then you find additional data and recompute the regression on the larger sample and that the result is an increase in the regression slope.
After an unusually dry atumn, a radio announcer ia heard to say, "Watch out! We'll pay for these sunny days later on this winter." Explain what he's trying to say, and comment on the validity of his reasoning.
In the past, Judy Holmes's tire dealership sold an average of 1,000 radials each year. In the past two years, 200 and 250, respectively, were sold in fall, 350 and 300 in winter, 150 and 165 in spring, and 300 and 285 in summer.
Other research examining the effects of preschool childcare has found that children who spent time in day care, especially high quality daycare, perform better on math and language tests than children who stay at home with their mothers
Compute descriptive statistics for each stock and the S&P 500. Comment on your results. Which stocks are the most volatile? Compute the value of beta for each stock. Which of these stocks would you expect to perform best in an up market? Which..
An appliance manufacturer claims to have developed a new toaster oven that consumes an average of no more than 250 W. From previous studies, it is believed that power consumption for toaster ovens is normally distributed with a variance of 324 W.
How might one know if an error was made in accepting or rejecting the null hypothesis? Do you suppose the nature of the research has an influence on the selection of the significance level? Why or why not?
Utilize a test of the difference among proportions when answering these questions. Illustrate the research hypothesis.
No, there is not enough information to refuse hypothesis that proportion of male students who live on campus and proportion of female students who live on campus are same as the test value -1.65 is inside acceptance region (-1.96,1.96).
Calculate, test, and interpret the relationship between two variables using the correlation coefficient.
Describe the relevant population and the source (e.g. newspaper, TV, radio, internet, etc.). Explain why you do not believe it is accurate.
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