Answers in Appendix B have been produced by rounding any approximate number two
ID: 3022317 • Letter: A
Question
Answers in Appendix B have been produced by rounding any approximate number two digits to the right of the decimal point, using the rounding procedure described in Section A.7 of Appendix A. Asked the question "During your lifetime, how often have you changed your permanent residence?," a group of 18 college students replied as follows: 1.3. 4.1, 0, 2. 5. 8. 0. 2, 3, 4. 7.11. 0. 2. 3. 3. Find the mode, median, and mean During their first swim through a water maze. 15 laboratory rats made the following number of errors (blind alleyway entrances): 2, 17, 5, 3, 28, 7, 5, 8, 5, 6, 2, 12, 10, 4, 3. Find the mode, median, and mean for these data. Without constructing a frequency distribution or graph, would you characterize the shape of this distribution as balanced, positively skewed, or negatively skewed? In some racing events, downhill skiers receive the average of their times for three trials. Would you prefer the average time to be the mean or the median if usually you have one very poor time and two average times? one very good time and two average times? two good times and one average time? W) three different times, spaced at about equal intervals?Explanation / Answer
3.9).
Sorted data
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0
0
1
1
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3
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11
Mean = sum/n =59/18 =3.28
Median =3
Mode =3
3.10). Data sorted
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2
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17
28
Mean = sum/n =117/15 = 7.80
Median =5
Mode =5
b).
28 is the extreme value, the data are positively skewed.
3.11).
a). median
b).median
c).mean
d). mean
Note: one very good time or one very poor time affects the mean.
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11
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