With 98% confidence interval and n = 25. Find left critical value for Zinterval. 0 -2.492
0 -2.05
0 -2.797
-2.326

And , the degrees of freedom are given by:

Then the critical value using the t distribution with 24 degrees of freedom is:

And the best solution would be:

0 -2.492

Step-by-step explanation:

For this problem we know that the sample size is n = 25. The confidence level is 98% or 0.98 then the significance would be:

And , the degrees of freedom are given by:

Then the critical value using the t distribution with 24 degrees of freedom is:

And the best solution would be:

0 -2.492

a = 3.14

b = 18

c = 18/5 or 3.6 or 3 3/5

step-by-step explanation:

x is the total time in minutes for the free response

you are given number of questions as 15 - m and time per item as 8 minutes

to find x multiply the two givens together:

x = 8 * (15-m) = 8(15-m)