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PSY/SOC 3010 Statistics Take Home Test 1

A take-home test in statistics for psychology and sociology students, focused on core statistical concepts.

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    PSY/SOC 3010 Statistics Take Home Test 1 Statistics Take Home Test 1 PSY/SOC 3010 Part A Instructions: Answer the following multiple choice questions by circling the correct answer. 1. In an experiment, a variable that differs in amount is called a a. qualitative variable b. quantitative variable c. independent variable d. statistical variable Answer: b. quantitative variable 2. A researcher is interested in studying hand - eye coordination of second - grade boys at Honey Island Elementary School. She selects 4 boys for study, measures them by having them shoot free throws and finds that they all receive the same score. In this study hand - eye coordination as measured by the number of free throws is measure on: a. a nominal scale b. a ordinal scale c. an interval scale d. a ratio scale Answer: d. a ratio scale 3. A researcher measures “race” on a questionnaire by having respondents indicate their race based on five options. This variable would be measured on: a. a ratio scale b. a continuous variable c. a dichotomous variable d. a discrete variable Answer: d. a discrete variable 4. When creating a grouped interval, frequency distribution table, a researcher should include approximately _______ class intervals. a. 5 - 15 b. 1 - 5 c. 15 - 20 d. as many as the researcher wants Answer: a. 5 - 15 5. A researcher creates a grouped interval, frequency distribution table using an interval size of three, and 19 is the lowest score in the sample. According to our guidelines, _______ would be

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    the best choice for the bottom interval. a. 19 - 22 b. 19 - 21 c. 10 - 20 d. 18 - 20 Answer: b. 19 21 6. When making a frequency table, the first column should a. include all observed values, starting from the highest and ending with the lowest b. include all possible values, starting with the lowest and ending with the highest c. begin with 0% at the top and go down to 100% at the bottom d. none of the above Answer: b. include all possible values, starting with the lowest and ending with the highest For questions 7 - 9 use the following frequency table: Score f 15 2 14 3 13 4 12 3 11 2 7. What is the “n” for the above frequency distribution? a. 4 b. 14 c. 20 d. 65 Answer: c. 20 8. What is the sum of all the scores in the above frequency table? a. 20 b. 65 c. 182 d. 270 Answer: b. 65 9. The score of 14 would have a cumulative frequency of a. 5 b. 14 c. 12 d. 3 Answer: c. 12 10. In a frequency polygon, the vertical axis represents a. possible values the variable can take

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    b. intensity of the histogram c. mean score d. none of the above Answer: b. intensity of the histogram 11. In terms of skewness, the normal bell - shaped curve is a. positively skewed b. negatively skewed c. not skewed at all d. mesokurtic Answer: c. not skewed at all 12. A statistics instructor collects data on the test scores of students in an introductory statistics class and discovers that most students did very poorly and only a few did well (including a few who did very well). How would the instructor describe the distribution of test scores? a. symmetrical b. negatively skewed c. having a floor effect d. positively skewed Answer: b. negatively skewed 13. Which of the following is true if a distribution is positively skewed? a. mode > median > mean b. mode < median < mean c. median > mode > mean d. median = mean = mode Answer: b. mode < median < mean 14. Based on the scores 2, 10, 3, 6, 2, 2, 6, 1, 2, and 6, a score of 4 is the: a. mode b. median c. mean d. range Answer: c. mean 15. The highest point of the curve in a distribution of scores is most closely associated with a. the mean b. the median c. the mode d. the standard deviation Answer: c. the mode 16. A sociologist finds that the number of things a group of twelve children can name are 3, 3, 3,

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