Answer:
At least 547 records need to be studied.
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
.
And the margin of error is:

95% confidence interval
So
, z is the value of Z that has a pvalue of
, so
.
In this problem, we have that:






At least 547 records need to be studied.
Answer:
freshman are smarter
Step-by-step explanation:
Answer:
0.55
Step-by-step explanation:
diference= 25/100*2.20=0.55
Answer:
4*4=16+7=23
Step-by-step explanation: