Question

2)L : study was reported in whic h ninth grade Minnesota teens were asked whether they had gambles at least once a week in the past year. The sample consisted of 49.1% boys and 50.9% girls. The proportion of boys who had gambled at least once per week during the past year was 0.045. Let B the event the person is a boy, and C the event the person is a weekly gambler. a) Write each of the figures above in proper notation 0.229, while among girls this proportion was only b) Create a hypothetical two-way table to represent this situation c) Create a tree diagram to represent this situation. 09人10 0 1000

Answer 1

(a)

(b)

From above we have

PlB"N C) = P(Cl 3°)P(B') = 0.045 . 0.509 = 0.022905

By the complement rule we have

Now,

b)

Total number of subjects 1000000.

Following is the completed two by two table:

c)

229 0.491 Ce BC 0.509 0.045 0.955 Ce

d)

e)

From table we have

So,