Answer:
5 and 9 because it is right
Step-by-step explanation:
5(6)819
10 less than 95
that is 95 - 10
85
<u>__ 10 less than 95____ _ _____</u>
| |
∨ ∨
85 86 87 88 89 90 91 92 93 94 95
----+----+-----+-----+-----+-----+-----+-----+-----+-----+----+----
Hope this helps :)
The answer is 2, 12 meters
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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