Question 1

When we find area to the right of z-score, why do we have to subtract the area from 1?

To answer this question, you can explain or show drawing of bell curve!

Question 2

If the population standard deviation is 38, how large a sample is necessary to have a standard error that is greater than 10 points?answer to the nearest hundredths place.

Question 3

IQ scores form a normal distribution with a mean of =105 and a standard deviation of = 11. What is the probability of obtaining a sample mean greater than M = 109 for a sample of n = 30 people? A. 0.0233

B. 0.9767

C. 0.8412

D. 0.9893

Question 4

Compute the standard error of the mean from the following scores; 45, 34, 65, 33, 15, 25

Round your answer to the nearest hundredths.

Question 5

Find the estimated standard error for the sample mean forn= 25 andSS= 3659.

Round to the nearest hundredths.