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.
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.
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.
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.

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