answer both of the following

A market researcher for a provider of music player accessories wants to know the proportion of customers who own cars to assess the market for a new car charger. A survey of 600 customers indicates that 73% own cars.

a) What is the estimated standard deviation of the sampling distribution of theproportion?

b) How large would the estimated standard deviation have been if he had surveyed only 150 customers(assuming the proportion is about thesame)?

a) The estimated standard deviation of the sampling distribution of the proportion is

.

(Round to four decimal places asneeded.)

b) The estimated standard deviation of the sampling distribution of the proportion would be

.

(Round to four decimal places asneeded.)