Chapter 13: Q.29 (page 765)
What are the Sum of Squares and Mean Squares Errors?
Short Answer
The sum of square of Errors is and mean square Errors is .
Chapter 13: Q.29 (page 765)
What are the Sum of Squares and Mean Squares Errors?
The sum of square of Errors is and mean square Errors is .
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Get started for freeAt the significance level, what can we say about the cyclists' variances?
Are the mean numbers of daily visitors to a ski resort the same for the three types of snow conditions? Suppose that Table 13.27 shows the results of a study.
Assume that all distributions are normal, the four population standard deviations are approximately the same, and the data were collected independently and randomly. Use a level of significance of .
Are the variances for incomes on the East Coast and the West Coast the same? Suppose that Table shows the results of a study. Income is shown in thousands of dollars. Assume that both distributions are normal. Use a level of significance of .
East | West |
Two coworkers commute from the same building. They are interested in whether or not there is any variation in the time it takes them to drive to work. They each record their times for commutes. The first worker’s times have a variance of . These coworkers' times have a variance of . The first worker thinks that he is more consistent with his commute times. Test the claim at the% level. Assume that commute times are normally distributed. What is the F statistic?
60. Suppose a group is interested in determining whether teenagers obtain their drivers licenses at approximately the same average age across the country. Suppose that the following data are randomly collected from five teenagers in each region of the country. The numbers represent the age at which teenagers obtained their drivers licenses.
Northeast | South | West | Central | East | |
16.3 | 16.9 | 16.4 | 16.2 | 17.1 | |
16.1 | 16.5 | 16.5 | 16.6 | 17.2 | |
16.4 | 16.4 | 16.6 | 16.5 | 16.6 | |
16.5 | 16.2 | 16.1 | 16.4 | 16.8 | |
------------------- | ------------------- | ------------------- | ------------------- | ------------------- | |
------------------- | ------------------- | ------------------- | ------------------- | ------------------- |
State the hypotheses.
13.2 The F Distribution and the F-Ratio
Use the following information to answer the next three exercises. Suppose a group is interested in determining whether teenagers obtain their drivers licenses at approximately the same average age across the country. Suppose that the following data are randomly collected from five teenagers in each region of the country. The numbers represent the age at which teenagers obtained their drivers licenses.
Northeast | South | West | Central | East | |
16.3 | 16.9 | 16.4 | 16.2 | 17.1 | |
16.1 | 16.5 | 16.5 | 16.6 | 17.2 | |
16.4 | 16.4 | 16.6 | 16.5 | 16.6 | |
16.5 | 16.2 | 16.1 | 16.4 | 16.8 | |
-------------------- | -------------------- | ------------------- | ------------------- | ----------------- | |
-------------------- | -------------------- | ------------------- | ------------------- | ----------------- |
: At least any two of the group means are not equal.
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