lease identify the types of variables among the choices below. Q1. Gender (male
ID: 3274958 • Letter: L
Question
lease identify the types of variables among the choices below.
Q1. Gender (male / female)
A. Quantitative
B. Ordinal
C. Nominal
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Q2. Your height (in centimeters)
A. Nominal
B. Ordinal
C. Quantitative
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Q3. Your height (in inches)
A. Nominal
B. Ordinal
C. Quantitative
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Q4. Level of interest in Statistics (Very interested / Somewhat interested / Not interested)
A. Quantitiave
B. Ordinal
C. Nominal
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The variable “gender” is also called dichotomous variable because it only takes two values.
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Assume that the prevalence of Alzheimer's disease in the population (per 100 population) is as follows:
Age group Males Females
65-69 1.6 0.0
70-74 0.0 2.2
75-79 4.9 2.3
80-84 8.6 7.8
85+ 35.0 27.9
Suppose that a 77-year old man, a 76-year old woman, and an 82-year old woman are selected at random from this population.
What is the probability that all three of the selected people will have Alzheimer's?
A. 0
B. .00325
C. .000088
D. .15
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Using the same three randomly selected people, what is the probability that at least one of the women has Alzheimer’s disease?
A. .099
B. 0
C. .101
D. .00179
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What is the probability that a 92 year old woman randomly selected from this population does NOT have Alzheimer's? Do not round your answer.
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Assume that, independent of Alzheimer's, men aged 75 years old have a 25% chance of having had hip replacement surgery. What is the probability of a randomly selected 75 year old male not having Alzheimer's and having a hip replacement?
Round to the nearest hundredth decimal.
Explanation / Answer
1. Nominal; Option C
2. Quantitative; Option C
3. Quantitative; Option C
4. Ordinal; Option B
5. True
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