Tv ratings in 7000 households. nielsen estimates that 18,000 people live here. suppose nielsen reports american idol had 65% of tv audience. interpret results with 95% confidence based on sample size of18,000 people.

margin of error?

confidence intervals is from % to %

Margin of error = 0.07

Confidence intervals is from 64.3% to 65.7%.

Step-by-step explanation:

Let p be the population proportion of tv audience American idol had.

The formula to find the margin of error is given by :-

, where z* = Critical value , = Sample proportion and n = sample size.

We are given that :

n= 18000

By z-table , Critical value for 95% confidence interval : z*= 1.96

Margin of error:

i.e. Margin of error = 0.07

Confidence interval for population proportion =

=

Hence, Confidence intervals is from 64.3% to 65.7%.

the first one

step-by-step explanation:

just id the test.