Question
MATH225 Statistical Reasoning for the Health Sciences
Week 4 Assignment Contingency Tables
Question Given the contingency table below, determine the
marginal distribution of swimmers and non-swimmers. Round your
answer(s) to the nearest whole number. Select all that apply.
People Can
Swim
Cannot Swim Total
Vegetarian
129
181 310
Non-vegetarian
101
69 170
Total
230
250 480
48%
52%
65%
35%
Question Researchers wanted to study if couples having
children are married. They surveyed a large group of people. The
data are shown in the contingency table below. What is the relative
risk of being married for those who have children? Round your
answer to two decimal places.
MarriedNot MarriedTotalChildren9768165No
Children3571106Total132139271
Question Fill in the following contingency table and find the
number of students who both have a cat AND have a dog.
StudentshaveacatdonothaveacatTotalhaveadog46donothaveadog17Total4998
Question In a recent survey, a group of people were asked if
they were happy or unhappy with the state of the country. The data
are shown in the contingency table below, organized by political
party. What is the odds ratio for people unhappy with the state of
the country to be republicans against people happy with the state
of the country to be republicans? Round your answer to two decimal
places.
RepublicanDemocratTotalHappy152104256Unhappy98146244Total250250500
Question Given the contingency table below, determine the
marginal distribution of the bread and rice. Round your answer(s)
to the nearest whole number. Select all that apply.
Food Bread
Rice Total
Breakfast
122
189 311
Lunch
420
263 683
Total
542
452 994
55%
45%
31%
69%
Question Fill in the following contingency table and find the
number of students who both do not go to the beach AND do not go to
the mountains.
StudentsgotothebeachdonotgotothebeachTotalgotothemountains32donotgotothemountains32Total5427
Question Given the contingency table below, determine the
marginal distribution of breakfast and lunch. Round your answer(s)
to the nearest whole number. Select all that apply.
Food Bread
Rice Total
Breakfast
122
189 311
Lunch
420
263 683
Total
542
452 994
55%
45%
31%
69%
Question
Does not Work in an
Office Works
in an
Office
Total
Does not Work
Saturday
11
47 58
Works
Saturday
6
76 82
Total
17
123 140
A survey of 140 employed citizens was conducted and the
results are shown in the table above. Given that a randomly
selected survey participant does not work in an office, what is the
probability that this person works on Saturday?
•
Write answer in reduced fraction form.
Question Researchers wanted to study if wearing cotton
clothes is related to depression. They surveyed a large group of
people. The data are shown in the contingency table below. What is
the relative risk of wearing cotton clothes for those who are
depressed? Round your answer to two decimal places.
CottonNot cottonTotalDepressed122420542Not
depressed189263452Total311683994
Question Researchers wanted to study if having a long beak is
related to flight in birds. They surveyed a total of 34 birds. The
data are shown in the contingency table below. What is the relative
risk of flying for those birds that have long beaks? Round your
answer to two decimal places.
Long beakNot a long beakTotalFlies11718Does not
fly31316Total142034
Question Fill in the following contingency table and find the
number of students who both watch comedies AND watch dramas.
StudentswatchcomediesdonotwatchcomediesTotalwatchdramas38donotwatchdramas52Total4165
Question Fill in the following contingency table and find the
number of students who both have a cat AND have a dog.
StudentshaveacatdonothaveacatTotalhaveadog27donothaveadog36Total6038
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