Answer:
We need a sample size of 1068.
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:
95% confidence level
So , z is the value of Z that has a pvalue of , so .
In this problem:
We need a sample size of n.
n is found when
We do not know the exact proportion, so we use , which is when we are are going to need the largest sample size. So
Rounding up
We need a sample size of 1068.
Answer:
x = 4.2 cm
Step-by-step explanation:
12.6/14.7 = x/4.9
cross-multiply to solve for 'x':
14.7x = 12.6(4.9)
14.7x = 61.74
x = 61.74÷14.7
x = 4.2
Answer:
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Step-by-step explanation:
Answer:
The answer should be 14.
Step-by-step explanation:
14×7=98