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In the last exercise you saw that the linear model had some deficiencies. Let s create a better model.
a) Perhaps the cross-sectional area of a tree would be a better predictor of its age. Since area is measured in square units, try re-expressing the data by squaring the diameters. Does the scatterplot look better?
b) Create a model that predicts Age from the square of the Diameter.
c) Check the residuals plot for this new model. Is this model more appropriate? Why?
d) Estimate the age of a tree 18 inches in diameter.
The time spent by a factory worker A packing a box is a random variable with mean 3.5 minutes and standard deviation 1 minute. The times spent packing any two boxes are independent.
Suppose that the probability of parents having a child with blond hair is 1/4. If there are 6 children in the family, what is the probability that half of them will have blond hair?
use Microsoft excel, as your graphing calculator, or the binomial probability formula to calculate the probibilities of the following events. Event A: The probability that you will have to oay out exactly $20.
The Statistics students analyzing the data were asked to study the relationship between eye and hair color. They produced this plot:- Is their graph appropriate? If so, summarize the findings. If not, explain why not.
The formula for a regression equation is Y' = 2X + 9. What would be the predicted score for a person scoring 6 on X? If someone's predicted score was 14, what was this person's score on X
47% of students have children under 17 living at home with them. Find the probability that a random sample of 800 students will return more than 50% students with children under 17 living at home with them.
Find a 95% jackknife con?dence interval for the population mean mileage of the rental cars of this company.
What is the probability that the monthly consumption will be less than 59,100 kWh?- What is the probability that the monthly consumption will be between 59,000 and 60,300 kWh?
Conduct the test at the 0.05 level of significance whether the modification actually increased the life of the AAA battery. What was their decision rule?
At the 0.10 significance level was the sample result different from the usual pattern? Show how to plug this in megastat and if it is chi square or anova.
Characteristics of residential properties - Construct a table that includes the summary statistics (mean, standard deviation, minimum and maximum) of all the variables. Explain briefly your findings
What aspect of these histograms makes it difficult to compare the distributions?- What differences do you see between the distributions of January and July average temperatures?
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