in a survey 163 respondents say that they never use a credit

in a survey, 163 respondents say that they never use a credit card, 1217 say that they use it sometimes, and 2828 say that they use it frequently. what is the probability that a randomly selected person uses a credit card frequently? is it unlikely for someone to use a credit card frequently? how are all of these results affected by the fact that the responses were obtained by those who decided to respond to a survey on the internet? step by step solution

Solution

what is the probability that a randomly selected person uses a credit card frequently?

P( seleccting the person uses the card freq) = 2828 / (163+1217+2828) = .6720

is it unlikely for someone to use a credit card frequently?

No, it is not. as the reason probability recieved is higher than 0.50

how are all of these results affected by the fact that the responses were obtained by those who decided to respond to a survey on the internet?

It gives the picture that most of them uses the card frequenctly for there daily wages. People who doesn\'t use the card gives the probability as 0.03873 [ 163 / (163+1217+2828) ], can be considered as unusual event