Question

Focus groups of 14 people are randomly selected to discuss products of the Famous Company. It is determined that the mean number (per group) who recognize the Famous brand name is 8.3, and the standard deviation is 0.87. Would it be unusual to randomly select 14 people and find that greater than 12 recognize the Famous brand name?

Answer 1

Solution:

We are given,

= 8.3 and   = 0.87

So, =

= 0.23

We have to first find

P( ) = ________ ?

Use the standard normal table to conclude that:

P ( Z > 16.09 ) = 0

Which is less than 0.5

Hence it would be unusual  that greater than 12 recognize the Famous brand name

Done