Let the number of sports drinks April bought be represented by = s
Let the pizza slices April bought be represented by = p
As she spent a total of $21.25 so equation becomes:
As she bought 3 more sports drinks than pizza slices so, s = p+3
A high school student volunteers to present a report to the administration about the types of lunches students prefer. He survey
2 answers:
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Answer:
C. 50
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:
The higher the margin of error, the wider an interval is.
As the sample size increases, the margin of error decreases. If we want a widest possible interval, we should select the smallest possible confidence interval.
So the correct answer is:
C. 50