Answer:
d. It would become narrower
Step-by-step explanation:
The width of a normal confidence interval is given by:
In which z is the critical value according to the confidence level, is the standard deviation of the population and n is the size of the sample.
W and n are inverse proportional, that is, as n(the sample size) increases, W(the width of the interval) decreases, that is, the interval becomes narrower..
So the correct answer is:
d. It would become narrower
Answer:
And we can find the probability with this difference and using the normal standard table:
Step-by-step explanation:
Let X the random variable that represent the wages, and for this case we know the distribution for X is given by:
Where and
We want to find this probability:
And we can use the z score formula given by:
Using this formula we have:
And we can find the probability with this difference and using the normal standard table:
Answer:
504
Step-by-step explanation:
(24)(21)= 504