Statistics 221 BYU-I –
Study Guide, Exam
Review, Practice
Questions & Answers
Updated Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales
Included
, Which of the following variables is/are quantitative? The number of people in a randomly selected classroom on campus.
The weight of a BYU-I student.
Students in an Introductory Statistics class at BYU-Idaho An observational study, because the students did not impose any treatment on the
were studying prices of cold cereal at grocery stores in cereals.
Rexburg. To get a sample of cold cereal prices, they went
to Albertson's and rolled a die to decide which box from the
left of the top shelf they would start on. They then recorded
every 6th cereal after the first, moving from left to right
down the shelves, recording the name, size, and price of
each cereal in their sample. Is this study an experiment or
an observational study, and why?
Daniel was doing a statistical study. In which step of the Describe the Data
statistical process is he engaged when he creates a
histogram of his data and calculates a sample mean?
In order to estimate the average weight of all adults in the Stratified Sample
state of Idaho, you randomly select 50 adults from each
county in Idaho. Use this information for all the parts.
Part 1: What type of sampling method was done here?
In order to estimate the average weight of all adults in the The weights of all adults in the state of Idaho.
state of Idaho, you randomly select 50 adults from each
county in Idaho. Use this information for all the parts.
Part 2: What is the population in your study above?
You would like to test if females like math more than males H0: P male=P female
do. You collect a sample of 100 males and 57 females. HA: P male<P female
Among the 100 males, 32 say they like math. Among the
females, 21 say they like math. Use this information for all
the parts.
Part 1: What is the null and alternative hypothesis?
You would like to test if females like math more than males .269
do. You collect a sample of 100 males and 57 females.
Among the 100 males, 32 say they like math. Among the
females, 21 say they like math. Use this information for all
the parts.
What is the p-value for your test?
You would like to test if females like math more than males Yes, both and are larger than 10 for both groups.
do. You collect a sample of 100 males and 57 females.
Among the 100 males, 32 say they like math. Among the
females, 21 say they like math. Use this information for all
the parts.
Part 3: Are the requirements for the above test satisfied?
Tanker trucks are designed to carry huge quantities of .908
gasoline from refineries to filling stations. A factory that
manufactures the tank of the trucks claims to manufacture
tanks with a capacity of 8550 gallons of gasoline. The
actual capacity of the tanks is normally distributed with
mean gallons and standard deviation gallons.
Part 1: What is the probability that a randomly chosen
truck will have a capacity greater than 8528 gallons?
Study Guide, Exam
Review, Practice
Questions & Answers
Updated Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales
Included
, Which of the following variables is/are quantitative? The number of people in a randomly selected classroom on campus.
The weight of a BYU-I student.
Students in an Introductory Statistics class at BYU-Idaho An observational study, because the students did not impose any treatment on the
were studying prices of cold cereal at grocery stores in cereals.
Rexburg. To get a sample of cold cereal prices, they went
to Albertson's and rolled a die to decide which box from the
left of the top shelf they would start on. They then recorded
every 6th cereal after the first, moving from left to right
down the shelves, recording the name, size, and price of
each cereal in their sample. Is this study an experiment or
an observational study, and why?
Daniel was doing a statistical study. In which step of the Describe the Data
statistical process is he engaged when he creates a
histogram of his data and calculates a sample mean?
In order to estimate the average weight of all adults in the Stratified Sample
state of Idaho, you randomly select 50 adults from each
county in Idaho. Use this information for all the parts.
Part 1: What type of sampling method was done here?
In order to estimate the average weight of all adults in the The weights of all adults in the state of Idaho.
state of Idaho, you randomly select 50 adults from each
county in Idaho. Use this information for all the parts.
Part 2: What is the population in your study above?
You would like to test if females like math more than males H0: P male=P female
do. You collect a sample of 100 males and 57 females. HA: P male<P female
Among the 100 males, 32 say they like math. Among the
females, 21 say they like math. Use this information for all
the parts.
Part 1: What is the null and alternative hypothesis?
You would like to test if females like math more than males .269
do. You collect a sample of 100 males and 57 females.
Among the 100 males, 32 say they like math. Among the
females, 21 say they like math. Use this information for all
the parts.
What is the p-value for your test?
You would like to test if females like math more than males Yes, both and are larger than 10 for both groups.
do. You collect a sample of 100 males and 57 females.
Among the 100 males, 32 say they like math. Among the
females, 21 say they like math. Use this information for all
the parts.
Part 3: Are the requirements for the above test satisfied?
Tanker trucks are designed to carry huge quantities of .908
gasoline from refineries to filling stations. A factory that
manufactures the tank of the trucks claims to manufacture
tanks with a capacity of 8550 gallons of gasoline. The
actual capacity of the tanks is normally distributed with
mean gallons and standard deviation gallons.
Part 1: What is the probability that a randomly chosen
truck will have a capacity greater than 8528 gallons?
