dis1.solu

# Dis1.solu - STA 13A Discussion 1 Solutions Thomas Lee 1.8 a-b The variable"survival time is a quantitative continuous variable c The population of

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1 STA 13A Discussion 1 Solutions Thomas Lee 1.8 a-b The variable “survival time” is a quantitative continuous variable. c The population of interest is the population of survival times for all patients having a particular type of cancer and having undergone a particular type of radiotherapy. d-e Note that there is a problem with sampling in this situation. If we sample from all patients having cancer and radiotherapy, some may still be living and their survival time will not be measurable. Hence, we cannot sample directly from the population of interest, but must arrive at some reasonable alternate population from which to sample. 1.10 a-b The variable “category” is a qualitative variable measured for each of fifty people who constitute the experimental units. c The pie chart is constructed by partitioning the circle into four parts, according to the total contributed by each part. Since the total number of people is 50, the total number in category A represents 11 50 0.22 = or 22% of the total.

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## This note was uploaded on 02/27/2012 for the course STA 13 taught by Professor Samaniego during the Spring '10 term at UC Davis.

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Dis1.solu - STA 13A Discussion 1 Solutions Thomas Lee 1.8 a-b The variable"survival time is a quantitative continuous variable c The population of

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