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STRAIGHTERLINE INTRODUCTION
TO STATISTICS EXAM | QUESTIONS
& ANSWERS (VERIFIED) | LATEST
UPDATE | GRADED A+
Question : Four steps in the process of statistics
Correct answer: 1. Producing Data 2. Exploratory Data
Analysis 3. Probability 4. Inference
Question : Categorical variable
Correct answer: places individuals into one of several groups
Two types: nominal and ordinal
Question : Quantitative Variable
Correct answer: represents a measurement or a count Two
types: Interval and ratio
Question : Nominal Variable
Correct answer: categorical variables where there is no
natural order among the categories
Question : Ordinal variable
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Correct answer: categorical variables where there is natural
order among the categories
Question : Interval Variable
Correct answer: a measurement or count for which it makes
sense to talk about the difference between values, but it does not make sense to talk about the ratio between values; 0 does not represent the absence of quanitity
Question : Ratio Variable
Correct answer: quantitative variables for which it makes
sense to talk about the difference between values AND the ratio between values; 0 represents the absence of quantity
Question : What type of variable?: eye color
Correct answer: nominal
Question : What type of variable?: socioeconomic status with categories low, med, high
Correct answer: Ordinal
Question : What type of variable?: Temperature
Correct answer: Interval
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Question : What type of variable?: Income
Correct answer: Ratio
Question : Visual display and numerical summary for a single
categorical variable
Correct answer: pie chart or bar chart and category
percentages
Question : Visual display and numerical summary for a single
quantitative variable
Correct answer: histogram or stemplot and descriptive
statistics
Question : Visual display and numerical summary for C->C
Correct answer: Two way table and conditional percentages
Question : Visual display and numerical summary for C->Q
Correct answer: Side by side box plots and descriptive
statistics
Question : Visual display and numerical summary for Q->Q
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Correct answer: Scatterplot and correlation coefficient (r)
Question : Standard Deviation Rule
Correct answer: Approximately 68% of observations fall
within 1 sd of the mean, 95% within 2 sd, 99.7% (or virtually all) within 3 sds
Question : Interquartile Range (IQR)
Correct answer: Middle 50% of the data IQR= Q3-Q1
Question : Finding an outlier using IQR
Correct answer: An observation is considered a suspected
outlier if it is: less than Q1 - 1.5(IQR), or more than Q3 +
1.5(IQR).
Question : Interpreting scatterplots: 1. positive relationship displays as 2. negative relationship displays as
Correct answer: 1. upward slope 2. downward slope
Question : Interpreting Scatterplots: How to tell if a linear relationship is strong or weak