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Joe is being audited by the IRS and must provide an estimate for his investment earnings over the next four years. After a thorough search, Joe can only find the following records.
Show how Joe can provide a reasonable estimate for 2007 - 2010.
Year Earnings
1997 $2,000
1998 $3,000
2000 $10,000
2003 $12,000
2004 $14,000
2006 $18,000
Calculate the standard deviation for this data = since it is a case of grouped data with classes. use group or class midpoints in the formula in place of x values.
Fitting of multiple linear regression equation - Give a list of the model assumptions for a regression model.
If, 20 patients improved, 7 declined, and 3 remained the same, assess whether or not patients undergoing this treatment are showing significant change from baseline to 3 months afterward. Report a p-value.
The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?
A researcher wants to collect data about the study habits of sophomores at Harmond University. From the sophomore class of 2,300 students, she wants to collect a sample of 70 students. Which of the following sampling methods will yield the most re..
Do the data indicate that the sleeping pill is effective at a 1% level of significance?
A manufacturing process makes items whose weights are normally distributed. It is known that 22.57% of all the items made weigh between 100 grams up to mean and 49.18% weigh from the mean up to 190 grams. Find out the standard deviation.
The number of girls who attend a summer basketball camp has been recorded for the seven years the camp has been offered.
How large a sample size will need to be selected if we wish to have a 99% confidence interval with a margin for error of .10 oz?
Using data provided, test if there is a difference between means at alpha =.05.
Predict the final average of a student who made an 83 on the first test. Give the value of r and r squared for this model. Interpret the value of r squared in the context of this problem.
Tompkins Associates reports that the mean clear height for a Class A warehouse in the Unites States is 22 feet. Suppose clear heights are normally distributed and that the standard deviation is 4 feet.
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