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The data in the next table resulted from an experiment that used a completely random design.
Treatment 1 Treatment 2 Treatment 3
3.8 5.4 1.3
1.2 2.0 0.7
4.1 4.8 2.2
5.5 3.8
2.3
a) Complete the following ANOVA table:
SOURCE df SS MS F
Treatments
Error
Total____________________________________________________________
b) Test the null hypothesis that u1 = u2 = u3, where ui represents the true mean for treament i, against the alternative that at least two of the means differ. Use = ? = .01.
Discuss whether this variable should be placed in the model as an ordinary quantitative variable or by means of four 0, 1 indicator variables.
Which of these following statements provides the best guidance for the model building?
A previous study of nickels showed that the standard deviation of the weight of nickels is 150 milligrams.
Do the data provide significant support for any preferences among the three brands? Test At the .05 level of significance.
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Recognize strategies that were utilized to control for nuisance variables and minimize threats to valid inference making.
A researcher is interested in whether social assertiveness might be influenced by training procedures. Two groups of college sophomores are randomly selected. Group A subjects are assigned to the "training sessions" and Group B subjects do not rec..
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If the sum of squares total is 800 and the sum of squares error is 170. What is the r-squared value?
In the following observational studies, describe changes that could be made to the data collection process that would result in an experiment rather than an observation study. Also, offer suggestions about unseen biases or lurking variables that m..
For following set of scores, prepare a frequency distribution, a histogram, and a stem-and-leaf display for each variable. Also calculate the mean, the median and the standard deviation of each score.
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