ISS (Statistical Services) Statistics Paper I (New 2016 MCQ Pattern): Questions 210  213 of 461
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Question number: 210
» Probability » Law of Total Probability
Question
Patients are recruited onto the two arms (Control, Treatment) of a clinical trial. The probability that an adverse outcome occurs on the control arm is , and is for the treatment arm. Patients are allocated alternately onto the two arms, and their outcomes are independent. What is the probability that the first adverse event occurs on the control arm?
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 211
» Probability » Conditional Probability
Question
In describing the survival rate and life expectancy in a certain population, let denote the event of reaching the age of years and be the corresponding probability. If then, what is the probability that a 50 years old will die within 5 years?
Choices
Choice (4)  Response  

a.  0.253 

b. 


c.  0.965 

d.  Question does not provide sufficient data or is vague 

Question number: 212
» Probability » Distribution Functions and Properties
Question
Let X be a continuous random variable with the following PDF
where, is a positive constant. The value of is?
Choices
Choice (4)  Response  

a.  1 

b. 


c.  2 

d.  None of the above 

Question number: 213
» Probability » Discrete and Continuous Random Variables
Question
Z is the distance traveled by a randomly chosen business consultant last year. Is the random variable Z discrete or continuous?
Choices
Choice (4)  Response  

a.  Can’t say anything 

b.  Sometime discrete sometime continuous 

c.  Discrete 

d.  Continuous 
