Answer:
The 90% confidence interval for the percentage of people the company contacts who may buy something is between 10.82% and 14%
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of
, and a confidence level of
, we have the following confidence interval of proportions.

In which
z is the zscore that has a pvalue of
.
For this problem, we have that:

90% confidence level
So
, z is the value of Z that has a pvalue of
, so
.
The lower limit of this interval is:

The upper limit of this interval is:

The 90% confidence interval for the percentage of people the company contacts who may buy something is between 10.82% and 14%
Answer:
12m+11w ( i don't think this is right)
Step-by-step explanation:
$7m+5m=12m
3w+8w=11w

So the final answer is 2/3
Answer:29 quarter and 4 nickels
Step-by-step explanation:
7.45= ? Quarters + ? nickles
7(4)+1= 28 quarters
45-25= 20/5 4nickles
Answer:140
Step-by-step explanation: