Answer:
So the answer for this case would be n=25 rounded up to the nearest integer
Step-by-step explanation:
Previous concepts
A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".
The margin of error is the range of values below and above the sample statistic in a confidence interval.
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
Solution to the problem
The margin of error is given by this formula:
(a)
And on this case we have that ME =4 and we are interested in order to find the value of n, if we solve n from equation (a) we got:
(b)
The critical value for 90% of confidence interval now can be founded using the normal distribution. And in excel we can use this formla to find it:"=-NORM.INV(0.05;0;1)", and we got
, replacing into formula (b) we got:
So the answer for this case would be n=25 rounded up to the nearest integer
Answer:
c is the answer for the question
Answer:
60 +70+8x+2 = 180 by aum of the angles of triangle is 180 degree
Answer:
12x^2
Step-by-step explanation:
All you need to do is combine like terms
since 9x^2 and 3x^2 are like terms with the same variable and same degree, they can be combined to get 12x^2