Question 1
pts
You may find the following files helpful throughout the exam:
Statistics_Equation_Sheet
(Links to an external site.)
Standard Normal Table
(Links to an external site.)
Suppose that you take a sample of size 50 from a population
that is not normally distributed. Can the sampling distribution of
x̄ be approximated by a normal probability distribution?
Your Answer:
No, It cannot be approximated by a normal prob. distribution since
the population is not normally distributed, the sample size should
be close/around to 30 in order to meet the criteria.
Yes. The sample size is greater than 30, therefore, we may
approximate by a normal probability distribution.
Question 2
pts
You may find the following files helpful throughout the exam:
Statistics_Equation_Sheet
(Links to an external site.)
Standard Normal Table
(Links to an external site.)
Suppose that you are attempting to estimate the annual income of
1200 families. In order to use the infinite standard deviation
formula, what sample size, n, should you use?
Your Answer:
, n/N
≤
0.05
n/1200
≤
0.05
n
≤
(0.05 x 12000= n
≤
60
Here the sample size is more than .05 therefore we should not
use the infinite standard dev. formula
In order to use infinite standard deviation formula, we
should have:
n≤0.05(1200)
n≤60
So, the sample size should be less than 60.
Question 3
pts
You may find the following files helpful throughout the exam:
pts
You may find the following files helpful throughout the exam:
Statistics_Equation_Sheet
(Links to an external site.)
Standard Normal Table
(Links to an external site.)
Suppose that you take a sample of size 50 from a population
that is not normally distributed. Can the sampling distribution of
x̄ be approximated by a normal probability distribution?
Your Answer:
No, It cannot be approximated by a normal prob. distribution since
the population is not normally distributed, the sample size should
be close/around to 30 in order to meet the criteria.
Yes. The sample size is greater than 30, therefore, we may
approximate by a normal probability distribution.
Question 2
pts
You may find the following files helpful throughout the exam:
Statistics_Equation_Sheet
(Links to an external site.)
Standard Normal Table
(Links to an external site.)
Suppose that you are attempting to estimate the annual income of
1200 families. In order to use the infinite standard deviation
formula, what sample size, n, should you use?
Your Answer:
, n/N
≤
0.05
n/1200
≤
0.05
n
≤
(0.05 x 12000= n
≤
60
Here the sample size is more than .05 therefore we should not
use the infinite standard dev. formula
In order to use infinite standard deviation formula, we
should have:
n≤0.05(1200)
n≤60
So, the sample size should be less than 60.
Question 3
pts
You may find the following files helpful throughout the exam:
