Arandom sample of 125 students is chosen from a population of 4,000 students. if the mean iq in the sample is 100 with a standard deviation of 8, what is the 98% confidence interval for the students' mean iq score?

98.33 - 101.67

Step-by-step explanation:

The given Sample mean n= 100  

Standard deviation

Mean IQ in the sample

Standard error of mean =

Standard error of mean =

Thus, standard error =

Standard error of mean (SE)= 0.7155  

We know that  z - score for 98% confidence interval is 2.33 .

Now, 98% confidence interval will be

n-z(SE) and n+z(SE)

Hence, the 98% confidence interval for the students' mean IQ score will be 98.33 - 101.67

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

ask for details followreport by buttfacelily 2 minutes ago

answers

rauschg

rauschg · hand

know the answer? add it here!

step-by-step explanation:

i’m here for points.