BSNS 112: Exam Preparation Test Questions with Correct Answers.

BSNS 112: Exam Preparation Test
Questions with Correct Answers.
Descriptive statistics - Answer - methods of organizing, summarizing and presenting data in a
good form

e.g. graphs, tables, measures



Inferential statistics - Answer Random sample of data taken from a population to describe
and make inferences about the population



Types of data - Answer quantitative and qualitative



Quantitative data - Answer Numerical

e.g. Age in years



Qualitative data - Answer Grouped or categorical

e.g. S, M, L, XL, XXL



Categorical data (Qualitative) - Answer Nominal or Ordinal



Numerical data (Quantitative) - Answer Discrete or Continuous



Frequency - Answer x



Proportion - Answer p



Mean - Answer average



Median - Answer middle number



Mode - Answer most common number



Trimmed mode - Answer most common number with extreme 5% trimmed



Central locations - Answer Mean

, Median

Mode

Trimmed Mode



Measures of spread - Answer Range

Interquartile range

Variance



Range - Answer Max observation less Minimum



IQR - Answer Middle 50%



Variance - Answer Squared deviation around the mean



Standard Deviation (SD) - Answer average distance observations are away from the mean



Coefficient of variation - Answer no units = good for comparisons



relative measure of variability



used to compare variability between groups with different means



Box and whisker - Answer



Sample variance - Answer



Standard Deviation Equation - Answer



Coefficient of variation equation - Answer



Measure of shape - Answer Skewness and Kurtosis



Skewness - Answer A skewness value more than twice its std. error is taken to indicate
significant departure from symmetry

around 0 = symmetrical