7. Which single statistic listed below is best to convey the ACCURACY of an esti

Question

7. Which single statistic listed below is best to convey the ACCURACY of an estimate? o A. Confidence interval o B. Coefficient of variation C. Range a D. Standard Error a E. Variance 8. Which single statistic listed below is best to convey the Precision of an estimate? A. Confidence interval a B. Coefficient of variation a C. Range a D. Standard Error E. Variance 9. Data cleaning refers to any computational process that yields Select all that apply. A. descriptive statistics o B. associations among variables C, a count of missing values. D. a count of mislabeled data entries E. a test of statistical hypotheses a o 10. Which of the following measures of dispersion is best for comparing levels of variability across groups for cases in which the means also differ? o A. The range B. The standard error of the mean C. The mode D. The coefficient of variation 11. Data mining refers to any computational process that yields Select all that apply. o A. descriptive statistics o B. associations among variables o C. a count of missing values. o D. a count of mislabeled data entries a E. a test of statistical hypotheses 12. For ratio scale data, if the arithmetic mean is less than the median, what can be concluded about the data? Select all that apply. A. The mean is probably the best estimate of the central tendency of the data B. There must be an error in the calculation of the median C. The mean will be correlated with the standard deviation D. The mode will be between the mean and the median. E. The data are left skewed F. The data are right-skewed o a

Explanation / Answer

7) In order to measure accuracy, we use confidence interval. Thus, Option (A) is the correct choice. (Ans).

8) In order to measure precision, we use standard error. Hence, Option (D) is the correct choice. (Ans).

9) Data cleaning will yield a count of missing values and mislabeled entries. Hence, Option (C) and (D) are correct choices. (Ans).

10) While measuring dispersion, in case means also differ, the co-efficient of variation is the best measure. Hence, Option (D) is the correct choice. (Ans).

11) Data mining will yield descriptive statistics and association among variables. Hence, Option (A) and (B) are correct choices. (Ans).

12) When mean is less than median, the data is left skewed. Hence, Option (E) is the correct choice. (Ans).

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