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January 30, 2015

January 30, 2015

Posted by **Daniel** on Thursday, March 7, 2013 at 10:10am.

(1) Find the average number of wrong answers.

(2) Find the SD of the number of wrong answers.

- Statistics -
**PsyDAG**, Thursday, March 7, 2013 at 11:01am1. 10 - 6.2 = ?

2. 1.4

- Statistics -
**Anonymous**, Monday, March 11, 2013 at 5:49pm1.3.8

2.1.4

- Statistics -
**Gary**, Tuesday, March 12, 2013 at 1:23am"number wrong" = 10 - "number right" is a linear transformation that says, "Multiply the list by -1, then add 10." The addition does nothing to the SD, and the multiplication by -1 multiplies the SD by |-1|=1. So there's no change to the SD. In terms of the histogram, the histogram for "number wrong" is a flip of the histogram for "number right," so the SD stays the same.

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