Question

Two studies were completed in California. One study in northern California involved 1,000 patients; 74% of them experienced flulike symptoms during the month of December. The other study, in southern California, involved 500 patients; 34% of them experienced flulike symptoms during the same month. Which study has the smallest margin of error for a 98% confidence interval?

Answer 1

The northern California study with a margin of error of 3.2%.
The southern California study with a margin of error of 3.2%.
The northern California study with a margin of error of 4.9%.
The southern California study with a margin of error of 4.9%.

Answer 2

@DanJS

Answer 3

@Hero

Answer 4

@Loser66

Answer 5

Loser I dont get this that much

Answer 6

@vera_ewing

Answer 7

I think its southern california

Answer 8

Just write something and I will give you a medal @Loser66

Answer 9

What ever you want

Answer 10

hehhehe... I don't want medal, just interesting on the field I never know before.
Here is the answer: the first one.

Answer 11

I made a short research about it. I learn how to find the answer out, not guess!

Answer 12

Help me though

Answer 13

if the confidence is 98% , then z =2.33
for the NOrth one
the sample is 74%*1000= 740
hence p = 740/1000=0.74

Answer 14

Apply the formula
margin error = \(z*\sqrt{\dfrac{p(1-p)}{population}}=2.33*\sqrt\dfrac{0.74(1-0.74}{1000}\ )

Answer 15

=3.23%
the net is so bad.

Answer 16

Thanks