INTRODUCTION TO STATISTICAL
INVESTIGATIONS COMPREHENSIVE EXAM
SCRIPT VERIFIED QUESTIONS AND
SOLUTIONS GRADED APLUS
●● Statistics
Answer: the science of collecting, organizing, analyzing, and
interpreting data in order to make decisions
●● Two types of data sets are...
Answer: Population and Samples
●● Population
Answer: is the collection of all outcomes, responses, measurements, or
counts that are of interest.
●● Sample
Answer: is a subset, or part, of a population
●● Parameter
Answer: is a numerical description of a POPULATION characteristic
, ●● Statistic
Answer: is a numerical description of a SAMPLE characteristic
●● A survey of several hundred collegiate student-athletes in the United
States found that, during the season of their sport, the average time spent
on athletics by student-athletes is 50 hours per week.Decide whether
each number describes a population parameter or a sample statistic.
Answer: Solution: Because the average of 50 hours per week is based on
a subset of the population, it is a sample statistic.
●● The freshman class at a university has an average SAT math score of
514. Decide whether the numerical value describes a population
parameter or a sample statistic.
Answer: Solution: Because the average SAT math score of 514 is based
on the entire freshman class, it is a population parameter.
●● In a random check of several hundred retail stores, the Food and
Drug Administration found that 34% of the stores were not storing fish
at the proper temperature. Decide whether the numerical value describes
a population parameter or a sample statistic.
Answer: Solution: Because 34% is based on a subset of the population it
is a sample statistic.
●● The study of statistics has two major branches:
Answer: descriptive statistics and inferential statistics
INVESTIGATIONS COMPREHENSIVE EXAM
SCRIPT VERIFIED QUESTIONS AND
SOLUTIONS GRADED APLUS
●● Statistics
Answer: the science of collecting, organizing, analyzing, and
interpreting data in order to make decisions
●● Two types of data sets are...
Answer: Population and Samples
●● Population
Answer: is the collection of all outcomes, responses, measurements, or
counts that are of interest.
●● Sample
Answer: is a subset, or part, of a population
●● Parameter
Answer: is a numerical description of a POPULATION characteristic
, ●● Statistic
Answer: is a numerical description of a SAMPLE characteristic
●● A survey of several hundred collegiate student-athletes in the United
States found that, during the season of their sport, the average time spent
on athletics by student-athletes is 50 hours per week.Decide whether
each number describes a population parameter or a sample statistic.
Answer: Solution: Because the average of 50 hours per week is based on
a subset of the population, it is a sample statistic.
●● The freshman class at a university has an average SAT math score of
514. Decide whether the numerical value describes a population
parameter or a sample statistic.
Answer: Solution: Because the average SAT math score of 514 is based
on the entire freshman class, it is a population parameter.
●● In a random check of several hundred retail stores, the Food and
Drug Administration found that 34% of the stores were not storing fish
at the proper temperature. Decide whether the numerical value describes
a population parameter or a sample statistic.
Answer: Solution: Because 34% is based on a subset of the population it
is a sample statistic.
●● The study of statistics has two major branches:
Answer: descriptive statistics and inferential statistics
