Question

For each of the different confidence levels given below determine the appropriate z* to use to create a confidence interval for the population proportion. (Give the positive z* value, rather than the negative.)

C= 88%, z*=

C= 93%, z*=

C= 72%, z*=

Answer 1

Using Normal Probability Table,

C= 88%, z*= 1.55 ,Here, z* is z_{​​​​​​0.06.}

C= 93%, z*= 1.81 , Here z* is z_{​​​​​​0.035.}

C= 72%, z*= 1.08 , Here z* is z_{​​​​​​0.14.}