Answer the following statement(s) true (T) or false (F)

Question

1. Data cleaning is only necessary when you did not collect the data.
2. When grouping variables, intervals should be exhaustive and mutually exclusive.
3. Skewness is an appropriate measure when describing a nominal variable.
4. The median is an inappropriate statistic for variables measured at the nominal level
5. The interquartile range measures the difference between the first and fourth quartiles in a distribution.
6. In a monotonic relationship, the value of cases consistently increases on one variable as the value of cases increases on the other variable.
7. If the value of gamma is +1, then the variables are perfectly associated with each other.
8. Specification is when the original relationship is stronger under some condition(s) of a third variable and weaker under others.
9. The highest value in a distribution minus the lowest value in the distribution will provide the central tendency.
10. Standard deviation is the preferred measure of variation.
11. Descriptive statistics estimate the degree of confidence that can be placed in generalizations for a sample and for the population from which the sample was selected
12. A researcher reviews a distribution of a variable and notes that in the distribution the cases cluster to the right and the left tail of the distribution is longer than the right tail. This distribution is negatively skewed.
13. The "Base N" in a frequency distribution refers to the total number of cases
14. In order to calculate measures of variation, the data must be at the ordinal or ratio level.
15. A researcher finds that as age increases, the number of crimes committed decreases. The relationship between the two variables would be classified as positive.

Answer 1

1. False
2. True
3. False
4. True
5. False
6. True
7. True
8. True
9. True
10. True
11. False
12. True
13. True
14. True
15. False