For typical data sets the following rules of thumb hold: 65% of data are within the...
For typical data sets the following rules of thumb hold:
65% of data are within the interval [Average -
StDev, Average + StDev]
95% of data are within the interval [Average - 2*St
Dev, Average + 2*StDev]
13. A recent ACT administered to a local high school
yielded the following results:
Mean = 24.4 and Standard Deviation = 4.2. Which of the following is
true? (5 points)
- a. 65% of the students scored between 16 and 32.8
- b. 95% of the students scored between 16 and 33.8
- c. 65% of the students scored between 20.2 and 28.6
- d. 95% of the students scored between 20.2 and 28.6
Homework Answers
Answer
Average ± StDev range is: [20.2, 28.6] and it would hold 65% of observations.
Average ± 2*StDev range is: [16, 32.8] and it would hold 95% of observations.
Comparing the above two with each of the given answer options, Option C Answer.
DONE
Add Answer to:
For typical data sets the following rules of thumb hold:
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Consider the following data on x = rainfall volume (m) and y = runoff volume (m) for a particular location. X 5 12 14 16 23 30 40 49 55 67 72 80 96 112 127 y 4 10 13 14 15 25 27 45 38 46 53 69 82 99 105 Use the accompanying Minitab output to decide whether there is a useful linear relationship between rainfall and runoff. The regression equation...
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