Multiply by reciprocal
2/3 * 5/4 = 10/12 = 5/6
1.
If he uses a previous estimate of 22%
The problem states within 2 percentage points so the error
is 0.02. The z score for this is 2.575.
The solution would be: 0.22(1-0.22) (2.575/0.02)^2 = 0.1716
(16576.5625) = 2844.538125; therefore we need to round up and the sample size
would be 2845.
2.
If he does not use any prior estimates.
The sample size required to obtain 1 – α
* 100% confidence interval for p with a margin of error E, without a previous
estimate of p, is given by: n = 0.25 (z α/2 divided by E) ^2
Therefore, n = 0.25 (2.575/0.02)^2
= 0.25 (16576.5625)
=4144.14; but we need to round up. So the sample size is
4145.
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Answer:
1.19 minutes
Step-by-step explanation:
First, subtract the $3 monthly fee:
16.09 - 3
= 13.09
Then, divide this by 11:
13.09/11
= 1.19
So, he was billed for 1.19 minutes
