The manager of the Burrard Credit Union wishes to know if thereis a significant difference
between male and female customers’ interest in a proposed new typeof savings certificate. A
survey of 200 randomly selected customers has yielded the followingdata:
INTEREST
SEX Strong Moderate Weak Total
Male 30 25 25 80
Female 60 40 20 120
Total 90 65 45 200
(a) What percentage of customers shows a strong or moderateinterest in these savings
certificates? [2 marks]
ANSWER
(b) What percentage of customers is male AND shows a strong ormoderate interest in
these savings certificates? [2 marks]
ANSWER
(c) What percentage of male customers do NOT show a stronginterest in these savings
certificates? [2 marks]
ANSWER
(d) Among those customers who show a weak interest in thesetypes of savings certificates,
what is the probability that they are a female?
