A poll of 2,112 randomly selected adults showed that 89% of them own cell phones. The technology display below results from a test of the claim that 91% of adults own cell phones. Use the normal distribution as an approximation to the binomialdistribution, and assume a 0.05 significance level to complete parts(a) through(e).

Test of p=0.91 vs p0.91

Sample

X

N

Sample p

95% CI

Z-Value

P-Value

1

1886

2,112

0.892992

(0.879809,0.906176)

2.73

0.006