An analyst is reviewing a dataset of temperatures recorded at airports in the U. S. In a random sample of 87 airports, she finds the average summer temperature to be 87 degrees Fahrenheit. What value of z should be used to calculate a confidence interval with a 95% confidence level?

We use z = 1.96

Step-by-step explanation:

We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:

Now, we have to find z in the Ztable as such z has a pvalue of .

So it is z with a pvalue of , so

We use z = 1.96

step-by-step explanation:

. your answer will contain x - and y -terms. (1 point) x ( ¿¿ 2 − 7 ) 2 +( y 2 − 9 ) 2 √ ¿ 12. what is the distance from the directrix (the crocodile river) to the point ( x , y )? write this equation. your answer will contain a y -term.