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%.

3.4 pizzas

step-by-step explanation:

given is a scatter plot showing number of pizzas sold during weeks for different issues of coupon

y represents number of pizzas sold and x number of coupons issued

y is marked verticaly and x horizontally

the trend line is given as

y =3.4x+43

this says that even when no coupon is issued pizzas sold will be 43

and rate of change of pizza sold for 1 unit of coupon = slope = 3.4

i.e. when x increases by 1 unit y increases by 3.4 units

hence for each additional coupon issued 3.4 pizzas more will be sold

answer: do we write it

step-by-step explanation: