University of Texas, Arlington BSTAT 3321 Practice Final Exam Fall 2021

BSTAT 3321 Practice Final Exam 1. The two graphical techniques we usually use to present nominal data are a. bar chart and histogram b. pie chart and ogive c. bar chart and pie chart d. histogram and ogive 2. Which of the following are deceptive practices a. Using a pie chart instead of a bar chart b. Using a bar chart instead of a line graph c. Showing only absolute changes in value with a truncated vertical axis d. All of the above are deceptive 3. In a positively-skewed distribution, a. the median equals the mean b. the median is less than the mean c. the median is larger than the mean d. the mean, median, and mode are equal 4. The Empirical Rule states that the percentage of measurements in a data set (providing that the data set has a bell-shaped distribution) that fall within two standard deviations of their mean is approximately: a. 68% b. 75% c. 95% d. 99.7% 5. Which of the following statements is true for the following data values: 7, 5, 6, 4, 7, 8, and 12? a. The mean, median and mode are all equal b. Only the mean and median are equal c. Only the mean and mode are equal d. Only the median and mode are equal 6. Which of the following sampling plans does not use random methods of selections? a. Simple random sampling. b. Stratified random sampling. c. Random cluster sampling. d. Self- selected opinion poll. (SLOP)