1 tree makes approximately 230 newspapers. Estimate (by rounding each number to 1 S.F.) how many newspapers 56 trees will make.
2 answers:
Answer:
56 trees will make 10000 newspapers.
Step-by-step explanation:
Given:
One tree makes approximately 230 newspapers.
Now, for estimating how many newspapers will be made with 56 trees.
By multiplying trees with
newspapers we get,
.
And, rounding to one significant number (1 S.F.) is
.
Therefore, 56 trees will make 10000 newspapers.
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Answer:
The minimum sample size should be of 381.
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 .
The margin of error is given by:
95% confidence level
So , z is the value of Z that has a pvalue of
, so
.
Without any prior knowledge of the proportion, what should be our minimum sample size
We dont know the population proportion, so we use , which is when the largest sample size is needed. We have to find n for which
. So
Rounding up
The minimum sample size should be of 381.
