Psych 625 Week 1 Individual Assignment Time to Practice Essay

1134 Words Aug 22nd, 2014 5 Pages
PSYCH 625 WEEK 1 Individual Assignment Time to Practice

Time to Practice – Week One Complete both Part A and Part B below. Part A Some questions in Part A require that you access data from Statistics for People Who (Think They) Hate Statistics. This data is available on the student website under the Student Test Resources link. 1. By hand, compute the mean, median, and mode for the following set of 40 reading scores: SUMMARY 31 | 32 | 43
What measure of central tendency would you use and why?

5. For the following set of scores, compute the range, the unbiased and the biased standard deviations, and the variance. Do the exercise by hand.

31, 42, 35, 55, 54, 34, 25, 44, 35

Why is the unbiased estimate greater than the biased estimate?

6. Use IBM®SPSS®software to compute all the descriptive statistics for the following set of three test scores over the course of a semester. Which test had the highest average score? Which test had the smallest amount of variability?

Test 1 | Test 2 | Test 3 | 50 | 50 | 49 | 48 | 49 | 47 | 51 | 51 | 51 | 46 | 46 | 55 | 49 | 48 | 55 | 48 | 53 | 45 | 49 | 49 | 47 | 49 | 52 | 45 | 50 | 48 | 46 | 50 | 55 | 53 |

7. This practice problem uses the data contained in the file named Ch. 3 Data Set 3. There are two variables in this data set.

Variable | Definition | Height | Height in inches | Weight | Weight in pounds |

Using IBM®SPSS®software, compute all of the measures of variability you can for height and weight.

8. Review the following frequency distribution. Create a histogram either by hand or by using some other application such as a Microsoft®Excel®document.

Class interval | Frequency | 90–100 | 12 |