Answer:
Due to the larger sample size, the confidence interval of the second group will have greater precision for estimating the population mean.
Step-by-step explanation:
Margin of error of a confidence interval:
The equation for the margin of error of a confidence interval has the following format:
In which z is related to the confidence level, 
is the standard deviation of the population and n is the size of the sample.
From this, we can infer that a larger size leads to a greater precision of the interval, that is, a lesser margin of error.
In this question:
The sample from the first group survey has 49 data values, and from the second group has 81.
Due to the larger sample size, the confidence interval of the second group will have greater precision for estimating the population mean.
Answer:
Step-by-step explanation:
Once again, we have a problem with the |x| in it, so like last time, every number that is the outcome within those brackets, is positive.
Let us check:
A. x = 21 over 4 and x = -11 over 4
This one is a very simple to say no to, as we are talking about decimals (if you convert into decimals at this point), as in -16 there are no decimals.
False.
B. x = -1 and x = 9
-1 is correct. But 9 is not. Why? Here:
9 + 5 is 14
14 the multiplied by -4 does not equal -16
False.
C. x = -1 and x = -9
Like what I said before, -1 is correct, now in this answer, -9 is also correct.
Unlike the last one, this one is -9 + 5 which is -4, then since it is inside the positive brackets, the number 4 becomes positive.
4 * -4 = -16
True.
The last one is incorrect. You know why
;)
Answer:
7+3 * 8
Step-by-step explanation:
It is 7+3*8 because if your going to check your work you can add 7 + 3 8s just to check it and you should get 31
The sum of the digits of a two-digit number is 11. when the digits are reversed, the number increases by 27. find the original number.
A= The width times the length
159 3/8= 18 6/8(I just put it into 8ths instead of fourths to make it easier) • X
Divide by 18 6/8 for both sides which will give you your X.
Meaning the 18 6/8 will cancel out on the one side. So that you can solve for that length(I would solve it but I don't have a calculator).
