Stat 201 Exam 1UPDATED ACTUAL QUESTIONS AND
CORRECT Answers
, What is a population? the set of subjects of interest
"all" or "every"
What is a sample? a subset of the population for whom we have (or plan to have) data, often
randomly selected
"a sample of" or "survey of"
What is descriptive statistics? refers to method of summarizing the collected data (where the data could be a
sample or a population)
"summarizing" or "average"
SAMPLE
What is inferential statistics? refers to methods of making decisions or predictions about a population,
based on the data obtained from a sample of that population
POPULATION
What is a parameter? any results/measurements calculated from the population
population=parameter
What is a statistic? any results/measurements calculated from the sample
sample= statistic
Quantitative vs Categorical Variables Quantitative: consists of values that represent a count or measure quantity
ex: age, number of absences, salary (measure and counts of something)
Categorical: consists of values that represent categories
ex: name, employee ID #
What are the 2 types of quantitative variables? Discrete
Continuous
What is a Discrete Quantitative Variable? Values that represent counts
only whole numbers, no decimals, usually says "the number of"
HW says "separate numbers"
What is a Continuous Quantitative Variable? Values that represent measurements
they can contain a decimal
HW says "forms an interval"
CORRECT Answers
, What is a population? the set of subjects of interest
"all" or "every"
What is a sample? a subset of the population for whom we have (or plan to have) data, often
randomly selected
"a sample of" or "survey of"
What is descriptive statistics? refers to method of summarizing the collected data (where the data could be a
sample or a population)
"summarizing" or "average"
SAMPLE
What is inferential statistics? refers to methods of making decisions or predictions about a population,
based on the data obtained from a sample of that population
POPULATION
What is a parameter? any results/measurements calculated from the population
population=parameter
What is a statistic? any results/measurements calculated from the sample
sample= statistic
Quantitative vs Categorical Variables Quantitative: consists of values that represent a count or measure quantity
ex: age, number of absences, salary (measure and counts of something)
Categorical: consists of values that represent categories
ex: name, employee ID #
What are the 2 types of quantitative variables? Discrete
Continuous
What is a Discrete Quantitative Variable? Values that represent counts
only whole numbers, no decimals, usually says "the number of"
HW says "separate numbers"
What is a Continuous Quantitative Variable? Values that represent measurements
they can contain a decimal
HW says "forms an interval"
