In a recent questionnaire about food, a random sample of970

adults were asked about whether they prefereating fruits or vegetables, and458

reported that they preferred eating vegetables.

What value ofz

should be used to calculate a confidence interval with a95%

confidence level?

z

0.10

z

0.05

z

0.025

z

0.01

z

0.005

1.282

1.645

1.960

2.326

2.576