STRAIGHTERLINE INTRODUCTION TO STATISTICS EXAM 2025 UPDATED ACTUAL EXAM
WITH CORRECT SOLUTIONS.
Four steps in the process of statistics - (ANSWER)1. Producing Data
2. Exploratory Data Analysis
3. Probability
4. Inference
Categorical variable - (ANSWER)places individuals into one of several groups
Two types: nominal and ordinal
Quantitative Variable - (ANSWER)represents a measurement or a count
Two types: Interval and ratio
Nominal Variable - (ANSWER)categorical variables where there is no natural order among the categories
Ordinal variable - (ANSWER)categorical variables where there is natural order among the categories
Interval Variable - (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
Ratio Variable - (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
What type of variable?:
eye color - (ANSWER)nominal
What type of variable?:
socioeconomic status with categories low, med, high - (ANSWER)Ordinal
, STRAIGHTERLINE INTRODUCTION TO STATISTICS EXAM 2025 UPDATED ACTUAL EXAM
WITH CORRECT SOLUTIONS.
What type of variable?:
Temperature - (ANSWER)Interval
What type of variable?:
Income - (ANSWER)Ratio
Visual display and numerical summary for a single categorical variable - (ANSWER)pie chart or bar chart
and category percentages
Visual display and numerical summary for a single quantitative variable - (ANSWER)histogram or
stemplot
and descriptive statistics
Visual display and numerical summary for C->C - (ANSWER)Two way table and conditional percentages
Visual display and numerical summary for C->Q - (ANSWER)Side by side box plots and descriptive
statistics
Visual display and numerical summary for Q->Q - (ANSWER)Scatterplot and correlation coefficient (r)
Standard Deviation Rule - (ANSWER)Approximately
68% of observations fall within 1 sd of the mean,
95% within 2 sd,
99.7% (or virtually all) within 3 sds
Interquartile Range (IQR) - (ANSWER)Middle 50% of the data
IQR= Q3-Q1
WITH CORRECT SOLUTIONS.
Four steps in the process of statistics - (ANSWER)1. Producing Data
2. Exploratory Data Analysis
3. Probability
4. Inference
Categorical variable - (ANSWER)places individuals into one of several groups
Two types: nominal and ordinal
Quantitative Variable - (ANSWER)represents a measurement or a count
Two types: Interval and ratio
Nominal Variable - (ANSWER)categorical variables where there is no natural order among the categories
Ordinal variable - (ANSWER)categorical variables where there is natural order among the categories
Interval Variable - (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
Ratio Variable - (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
What type of variable?:
eye color - (ANSWER)nominal
What type of variable?:
socioeconomic status with categories low, med, high - (ANSWER)Ordinal
, STRAIGHTERLINE INTRODUCTION TO STATISTICS EXAM 2025 UPDATED ACTUAL EXAM
WITH CORRECT SOLUTIONS.
What type of variable?:
Temperature - (ANSWER)Interval
What type of variable?:
Income - (ANSWER)Ratio
Visual display and numerical summary for a single categorical variable - (ANSWER)pie chart or bar chart
and category percentages
Visual display and numerical summary for a single quantitative variable - (ANSWER)histogram or
stemplot
and descriptive statistics
Visual display and numerical summary for C->C - (ANSWER)Two way table and conditional percentages
Visual display and numerical summary for C->Q - (ANSWER)Side by side box plots and descriptive
statistics
Visual display and numerical summary for Q->Q - (ANSWER)Scatterplot and correlation coefficient (r)
Standard Deviation Rule - (ANSWER)Approximately
68% of observations fall within 1 sd of the mean,
95% within 2 sd,
99.7% (or virtually all) within 3 sds
Interquartile Range (IQR) - (ANSWER)Middle 50% of the data
IQR= Q3-Q1
