Question

In a random sample of 250 ​items, 42 are defective. If the null hypothesis is that 16 % of the items in the population are​ defective, what is the value of ZSTAT​?

Answer 1

Solution :

Given that,

= 0.16

1 - = 0.84

n = 250

x = 42

Point estimate = sample proportion = = x / n = 0.168

Test statistics

z = ( - ) / *(1-) / n

= ( 0.168 - 0.16) / (0.16*0.84) /250

= 0.345

The value of zstat is 0.345