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March 31, 2015

March 31, 2015

Posted by **dannie0913** on Saturday, October 27, 2012 at 6:11pm.

Waiting Time

4.21

5.55

3.02

5.13

4.77

2.34

3.54

3.2

4.5

6.1

0.38

5.12

6.46

6.19

3.79

a. Compute the mean and median.

b. Compute the variance, standard deviation, range, coefficient of variation, and Z scores. Are there any outliers? Explain.

c. Are the data skewed? If so, how?

"d. As a customer walks into the branch office during the lunch hour, she asks the branch manager how long she can expect to wait. The branch manager replies, “Almost

certainly less than five minutes.” On the basis of the results of (a) through (c), evaluate the accuracy of this statement."

- college math -
**PsyDAG**, Sunday, October 28, 2012 at 6:33pmAssuming the values are all in seconds, all the values are less than 5 minutes (300 seconds).

Median = point at which half the scores are below and half above.

The mean = sum of scores/number of scores

Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.

Standard deviation = square root of variance

Range = highest score - lowest

Z = (score-mean)/SD

I'll let you do the calculations.

- college math (Oooops) -
**PsyDAG**, Sunday, October 28, 2012 at 6:37pmI goofed. Now I see that the values are probably minutes and decimal portions of minutes. This invalidates my first statement…ONLY.

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