Question

1) A recent survey found that a bike on a roof rack resulted in a 28% reduction in mpg (miles per gallon) for sedan cars. A random sample of 100 people is selected.

Source: Consumer Reports, “The Better Way to Haul a Bike”, p. 18, May 2020.

a) the standard error of all possible sample proportions of reductions in mpg in sedan cars is ________.

b) 95% of the samples proportions symmetrically around the population proportion will have between ________% and ________% of reductions in mpg in sedan cars.

c) ________% of the samples are likely to have between 26% and 30% of reductions in mpg in sedan cars.

Answer 1