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# Count Five Test for Comparing Variation in Two ## Problem 19 BB Chapter 9.5

Elementary Statistics | 12th Edition

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Problem 19 BB

Count Five Test for Comparing Variation in Two PopulationsUse the original weights of pre-1964 quarters and post-1964 quarters listed in Data Set 21 in Appendix B. Instead of using the F test, use the following procedure for a “count five” test of equal variation. What do you conclude?

For the first sample, find the absolute deviation of each value. The absolute deviation of a sample value x is . Sort the absolute deviation values. Do the same for the second sample.Let c 1 be the count of the number of absolute deviation values in the first sample that are greater than the largest absolute deviation value in the other sample. Also, let c 2 be the count of the number of absolute deviation values in the second sample that are greater than the largest absolute deviation value in the other sample. (One of these counts will always be zero.)If the sample sizes are equal (n 1 = n 2),use a critical value of 5. If n 1 n 2, calculate the critical value shown below. If C1 ≥ critical value, then conclude that σ12=σ22. Ifc2 ≥ critical value, then conclude thatσ12=σ22. Otherwise, fail to reject the null hypothesis of σ12=σ22.   Step-by-Step Solution:

Step 1 of 1 :

a).

Given use the weights (g) of pre-1964 quarters and post-1964 quarters listed in Data Set 21 of Appendix B.

The table is given below.

...
 Pre-1964 Quarters  Pre-1964 Quarters  6.2771 0.084427 0.084427 6.2674 0.074727 0.074727 6.2371 0.044427 0.044427 6.2718 0.079127 0.079127 6.1501 -0.04257 0.04257 6.1949 0.002227 0.002227 6.0002 -0.19247 0.19247 6.2465 0.053827 0.053827
Step 2 of 3

Step 3 of 3

##### ISBN: 9780321836960

The answer to “Count Five Test for Comparing Variation in Two PopulationsUse the original weights of pre-1964 quarters and post-1964 quarters listed in Data Set 21 in Appendix B. Instead of using the F test, use the following procedure for a “count five” test of equal variation. What do you conclude?1. For the first sample, find the absolute deviation of each value. The absolute deviation of a sample value x is . Sort the absolute deviation values. Do the same for the second sample.2. Let c 1 be the count of the number of absolute deviation values in the first sample that are greater than the largest absolute deviation value in the other sample. Also, let c 2 be the count of the number of absolute deviation values in the second sample that are greater than the largest absolute deviation value in the other sample. (One of these counts will always be zero.)3. If the sample sizes are equal (n 1 = n 2),use a critical value of 5. If n 1 n 2, calculate the critical value shown below. 1. If C1 ? critical value, then conclude that ?12=?22. Ifc2 ? critical value, then conclude that?12=?22. Otherwise, fail to reject the null hypothesis of ?12=?22.” is broken down into a number of easy to follow steps, and 203 words. This full solution covers the following key subjects: sample, deviation, absolute, critical, count. This expansive textbook survival guide covers 121 chapters, and 3629 solutions. The full step-by-step solution to problem: 19 BB from chapter: 9.5 was answered by Sieva Kozinsky, our top Statistics solution expert on 03/15/17, 10:30PM. Since the solution to 19 BB from 9.5 chapter was answered, more than 228 students have viewed the full step-by-step answer. This textbook survival guide was created for the textbook: Elementary Statistics, edition: 12th. Elementary Statistics was written by Sieva Kozinsky and is associated to the ISBN: 9780321836960.

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