Biostatistics Midterm questions with verified answers A+ rated

Biostatistics Midterm questions with
verified answers A+ rated

Not probability rule - correct answer ✔✔The probability of some event X not happening is 1 minus the
probability of it happening



Prob (not X)= 1- Prob (X)



And probability rule - correct answer ✔✔For two independent events, X and Y, the probability of event X
and event Y both happening



Prob (X and Y)= Prob (X) x Prob (Y)



OR probability rule - correct answer ✔✔The probability of one or the other or both events happening is
given by a more complicated formula:



Prob (X or Y)= 1- (1-Prob(X)) x (1-Prob(Y))



What are the types of distributions of data? - correct answer ✔✔Normal, log-normal, Binomial, Poisson



Normal distribution - correct answer ✔✔Familiar, bell shaped distribution describes an enormous
number of variables you encounter



Log-normal distribution - correct answer ✔✔The skewed, log-normal distribution



Binomial distribution - correct answer ✔✔Describes proportions



Poisson distribution - correct answer ✔✔Number of occurrences of sporadic random events