Answer:
144
Step-by-step explanation:
12 times 12
Answer:
$9.62
Step-by-step explanation:
There are 52 weeks in a year. This makes the problem 500/52. which is equal to 9.61538461538. This number does not fit into a real world scenario, but can be rounded to 9.62.
Answer:
20
Step-by-step explanation:
20- coefficient
w- variable
Answer:
The researcher should use a sample size of at least 140 children to get a margin of error to be within 2%.
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of
, and a confidence interval
, we have the following confidence interval of proportions.

In which
z is the zscore that has a pvalue of
.
is the margin of error.
95% confidence interval
So
, z is the value of Z that has a pvalue of
, so
.
We have that:

So





The researcher should use a sample size of at least 140 children to get a margin of error to be within 2%.