The claim is taht the proportion of peas with yellow pods is

The claim is taht the proportion of peas with yellow pods is equal to 0.25 (or 25%). The sample statistics from one experiment include 560 peas with 127 of them having yellow pods find the value of the test statistic.

The value of the test statistic is _________ (round to 2 decimal places as needed)

Solution

phat= 127/560= 0.2267857

The test statistic is

Z=(phat-p)/sqrt(p*(1-p)/n)

=(0.2267857-0.25)/sqrt(0.25*0.75/560)

=-1.27