How to test the change in two proportions.
A test was conducted to conclude whether gender of a spokesperson affected the likelihood that consumers would prefer a new product. A survey of consumers at trade display employing a female spokesperson determined that 70 out of 150 customers preferred the product while 62 of 180 customers preferred the product when a male spokesperson was employed. At the 0.01level of consequence do the samples provide sufficient evidence to indicate that on the average more consumers favour a new product when the spokesperson is female?