Question

It has been reported that only 42% of cyclist routinely wear helmets.A helmet company pairs with a healthcare company to produce a marketing campaign to promote wearing helmets.After the campaign is launched a survey of 140 cyclist is done to see if there is a change in the number is in number of people wearing helmets.

A) Assume for the moment the campaign has no effect on helmet wearing if ^p is the sample proportion of those who wear helmets what are the mean and standard deviation of the sampling distribution of ^p. Make sure any necessary conditions must be met

Answer 1

B)In fact 75 of the 140 cyclist report now that they do wear helmets.Does this provide sufficient evidence that helmet use has increased. support your answer with appropriate probability equations.

Answer 2

@Nurali @johnweldon1993

Answer 3

@Ashleyisakitty