Week Two Practice Problems

University of Phoenix Material
 
Week Two Practice Problems
 
Prepare a written response to the following questions.
 
Chapter 2
 
12. For the following scores, find the mean, median, sum of squared deviations, variance, and standard deviation:
 
1,112; 1,245; 1,361; 1,372; 1,472
 
Mean is 1312
Median is 1361
Sum of squared deviations is 76089.2
Variance is 15218
Standard deviation is 123.361
 
16. A psychologist interested in political behavior measured the square footage of the desks in the official office for four U.S. governors and of four chief executive officers (CEOs) of major U.S. corporations. The figures for the governors were 44, 36, 52, and 40 square feet. The figures for the CEOs were 32, 60, 48, 36 square feet.
 
a. Figure theshow more contentThe amount of time it takes to recover physiologically from a certain kind of sudden noise is found to be normally distributed with a mean of 80 seconds and a standard deviation of 10 seconds. Using the 50%34%14% figures, approximately what percentage of scores (on time to recover) will be: Above 100? 2%
Below 100? 98%
Above 90? 84%
Below 90? 16%
Above 80? 50%
Below 80? 50%
Above 70? 84%
Below 70? 16%
Above 60? 98%
Below 60? 52%
 
18. Suppose that the scores of architects on a particular creativity test are normally distributed. Using a normal curve table, what percentage of architects have Z scores:
 
Above .10? 100% .10=.10%
Below .10? 100%-.10%=99.99%
Above .20? 100% .20%=.20%
Below .20? 100%-.20%=99.80%
Above 1.10? 100% 1.10%=101.10%
Below 1.10? 100%-1.10=98.90%
Above -.10? 100% .10=.10%
Below -.10? 100%-.10%=99.99%
 
Using a normal curve table 2% of the architects have Z scores.
 
21. Suppose that you are designing an instrument panel for a large industrial machine. The machine requires the person using it to reach 2 feet from a particular position. The reach from this position for adult women is known to have a mean of 2.8 feet with a standard deviation of .5. The reach for adult men is known to have a mean of 3.1 feet with a standard deviation of .6. Both womens and mens reach from this position is normally distributed. If this design is implemented:
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