Module 2
Practise questions 1
1) Categorize which of the following questions are biased and which are unbiased.
Biased Unbiased
DO YOU SUPPORT CHANGING THE LAWS TO WHO DO YOU PLAN TO VOTE FOR IN THE NEXT
PREVENT PEOPLE FROM MAKING THEMSELVES PRESIDENTIAL ELECTION?
AND OTHERS SICK BY SMOKING IN PUBLIC
PLACES?
ARE YOU ONE OF THOSE ANNOYING PEOPLE HOW MUCH WOULD YOU BE WILLING TO PAY
WHO LIKES POP SINGERS LIKE TAYLOR SWIFT? FOR A NEW CAR?
HOW MANY TIMES A WEEK DO YOU EAT RED
MEAT FOR DINNER?
2) Categorize which of the following questions are biased and which are unbiased.
Biased Unbiased
HOW MUCH MORE IMPORTANT IS LOCATION HOW MANY TELEVISIONS ARE IN YOUR HOME?
THAN PRICE WHEN PURCHASING A HOUSE?
DO YOU THINK THAT WE SHOULD ELIMINATE WHAT IS YOUR FAVORITE SEASON?
UNEMPLOYMENT INSURANCE SO PEOPLE WILL
BE MOTIVATED TO GET A JOB?
WHAT DO YOU THINK CAUSES POLITICIANS TO
BE SO NASTY TO ONE ANOTHER?
3) Categorize which of the following questions are biased and which are unbiased.
Biased Unbiased
WHY IS AIR TRAVEL GETTING MORE AND MORE ABOUT HOW MANY MEALS A WEEK DO YOU EAT
UNPLEASANT? AT HOME?
ARE YOU INTELLIGENT ENOUGH TO ENJOY THE HOW DO YOU PREFER TO SHOP: ONLINE, IN A
WORKS OF WILLIAM SHAKESPEARE? STORE, OR SOME OTHER WAY?
Practise Questions 2
, 1) If the average IQ is 100 and the standard deviation is 15, approximately what
percentage of people have IQs above 130?
10%
2.5%
CORRECT
5%
50%
130 is two standard deviations above the mean (130-100=30=2*15=2*stdev). We know
that approximately 95% of the distribution is within 2 standard deviations of the mean.
Therefore 5% must fall beyond 2 standard deviations, 2.5% at the top and 2.5% at the
bottom.
2) If a particular standardized test has a mean score of 500 and standard deviation
of 100, what percentage of test-takers score between 500 and 600?
95%
68%
34%
CORRECT
50%
100 is one standard deviation above the mean (600-500 =100= 1*100 = 1*stdev). We
know that approximately 68% of the distribution is within 1 standard deviation of the
mean. Therefore 34% must fall beyond 1 standard deviation above the mean.
3)
Recall that the z-value associated with a value measures the number of standard
deviations the value is from the mean. If a particular standardized test has an average
score of 500 and a standard deviation of 100, what z-value corresponds to a score of
350?
-150
-1.50
CORRECT
Practise questions 1
1) Categorize which of the following questions are biased and which are unbiased.
Biased Unbiased
DO YOU SUPPORT CHANGING THE LAWS TO WHO DO YOU PLAN TO VOTE FOR IN THE NEXT
PREVENT PEOPLE FROM MAKING THEMSELVES PRESIDENTIAL ELECTION?
AND OTHERS SICK BY SMOKING IN PUBLIC
PLACES?
ARE YOU ONE OF THOSE ANNOYING PEOPLE HOW MUCH WOULD YOU BE WILLING TO PAY
WHO LIKES POP SINGERS LIKE TAYLOR SWIFT? FOR A NEW CAR?
HOW MANY TIMES A WEEK DO YOU EAT RED
MEAT FOR DINNER?
2) Categorize which of the following questions are biased and which are unbiased.
Biased Unbiased
HOW MUCH MORE IMPORTANT IS LOCATION HOW MANY TELEVISIONS ARE IN YOUR HOME?
THAN PRICE WHEN PURCHASING A HOUSE?
DO YOU THINK THAT WE SHOULD ELIMINATE WHAT IS YOUR FAVORITE SEASON?
UNEMPLOYMENT INSURANCE SO PEOPLE WILL
BE MOTIVATED TO GET A JOB?
WHAT DO YOU THINK CAUSES POLITICIANS TO
BE SO NASTY TO ONE ANOTHER?
3) Categorize which of the following questions are biased and which are unbiased.
Biased Unbiased
WHY IS AIR TRAVEL GETTING MORE AND MORE ABOUT HOW MANY MEALS A WEEK DO YOU EAT
UNPLEASANT? AT HOME?
ARE YOU INTELLIGENT ENOUGH TO ENJOY THE HOW DO YOU PREFER TO SHOP: ONLINE, IN A
WORKS OF WILLIAM SHAKESPEARE? STORE, OR SOME OTHER WAY?
Practise Questions 2
, 1) If the average IQ is 100 and the standard deviation is 15, approximately what
percentage of people have IQs above 130?
10%
2.5%
CORRECT
5%
50%
130 is two standard deviations above the mean (130-100=30=2*15=2*stdev). We know
that approximately 95% of the distribution is within 2 standard deviations of the mean.
Therefore 5% must fall beyond 2 standard deviations, 2.5% at the top and 2.5% at the
bottom.
2) If a particular standardized test has a mean score of 500 and standard deviation
of 100, what percentage of test-takers score between 500 and 600?
95%
68%
34%
CORRECT
50%
100 is one standard deviation above the mean (600-500 =100= 1*100 = 1*stdev). We
know that approximately 68% of the distribution is within 1 standard deviation of the
mean. Therefore 34% must fall beyond 1 standard deviation above the mean.
3)
Recall that the z-value associated with a value measures the number of standard
deviations the value is from the mean. If a particular standardized test has an average
score of 500 and a standard deviation of 100, what z-value corresponds to a score of
350?
-150
-1.50
CORRECT
