PRACTICE QUESTIONS FINAL EXAMINATION FALL 2015 December 09 2

PRACTICE QUESTIONS FINAL EXAMINATION FALL 2015 December 09, 2010 Student Name: Last (4) T# - USE THE BACK PAGE IF YOU NEED MORE SPACE TO WRITE 1. Which of the following is NOT TRUE about use of statistics? One needs to know a little bit about experimental design or how a researcher a. conducts investigations. b. A little knowledge about methodology will provide us with a place to hang our statistics. c. In other words, statistics are not numbers that just appear out of nowhere. Rather, the numbers (data) are generated out of research. d. Statistics are merely a tool to help us answer research questions. As such, an understanding of methodology will facilitate our understanding of basic statistics All of the Above e. The strength of a relationship between two variables is best estimated by 2. Analysis of variance (ANOVA) b. a. Analysis of covariance (ANCOVA) e. Correlation Coefficient T-test. d. When there are only two means to compare, the t-test and the ANOVA F-test are equivalent-the relation between ANOVA and t is given by F-t·True/False There are at least 3 types of ANOVA-list and describe when they are used 3. 4 a. b. C. 5. The correlation coefficient may take on any value between plus and minus one. a. The sign of the correlation coefficient (+, -) defines the direction of the relationship, either positive or negative b. A positive correlation coefficient means that as the value of one variable increases, the value of the other variable increases; as one decreases the other decreases. c. A negative correlation coefficient indicates that as one variable increases, thee other decreases, and vice-versa. 6. Which of the following does not adequately describe a paired t-test? By comparing the same patient\'s numbers before and after treatment a. b. consist of a sample of matched pairs of similar units, c. One group of units that has been tested twice (a \"repeated measures\" t-test). d. Comparing data from a placebo roup to that of treatment group 7. The central tendency in statistics are measured by 3 statistical parameters what are they? a. b, 8. Suppose we are evaluating the effect of a medical treatment, and we enroll 100 subjects into our study, and then randomly assign 50 subjects to the treatment group and 50 subjects to the control group. In this case, we have two independent samples; what C. statistical analysis appropriate for the data generated here. a. b. c. d. One way Analysis of variance ANOVA Two way Analysis of variance ANOVA Paired T-Test Unpaired T-Test MYA12092010 finales935exam

Solution

1) all of above

2) coefficient of correlation

3 )TRUE

4) ANOVA OF 1 FACTOR

ANOVA OF 2 FACTOR

ANOVA OF 2 FACTOR WITH GROUPED SAMPEL

5)

THE SIGN FO CORRELATION DEFINES THE DIRECTION OF THE CORRELATION