For a population with a mean of µ = 100 and a standard deviation of σ = 12,
a. Find the z-score for each of the following X values.
X = 106, Z=
X = 115,Z=
X = 130,Z=
X = 91,Z=
X = 88,Z=
X = 64, z=
b. Find the score (X value) that corresponds to each of the following scores.
z = -1.00, x=
z = -0.50, X=
z = 2.00 , X=
z = 0.75, X=
z = 1.50, X=
z = -1.25, X=
Chapter 6 #8
What proportion of a normal distribution is located between each of the following z-score boundaries?
z = -0.50 and z = +0.50?
z = -0.90 and z = +0.90
z = -1.50 and z = +1.50
Chapter 6 #12
For a normal distribution with a mean of µ = 80 and a standard deviation = 20, find the proportion of the population corresponding to each of the following scores.
Scores greater than 85
Scores less than 100
Scores between 70 and 90
Chapter 6 #14
IQ test scores are standardized to produce a normal distribution with a mean of µ = 100 and a standard deviation of σ = 12. Find the proportion of the population in each of the following IQ categories.
Genius or near genius: IQ greater than 140
Very superior intelligence: IQ between 120 and 140
Average or normal intelligence: IQ between 90 and 109
Chapter 6 #18
Information from the Department of Motor Vehicles indicates that the average age of licensed drivers is µ = 45.7 years with a standard deviation of σ = 12.5 years. Assuming that the distribution of drivers’ ages is approximately normal,
a. What proportion of licensed drivers are older than 50 years old?
b. What proportion of licensed drivers are younger than 30 years old?
For a population with a mean of µ = 70 and a standard deviation of σ = 20, how much error, on average, would you expect between the sample mean (M) and the population mean for each of the following sample sizes”
a. n = 4 scores
b. n = 16 scores
c. n = 25 scores
n = 6, σ = 20, σM =
n = 16, σ = 20, σM =
n = 25, σM =
If the population standard deviation is σ = 8, how large a sample is necessary to have a standard error that is:
a. less than 4 points?
b. less than 2 points?
c. less than 1 point?
Chapter 5 #8
A sample has a mean of M = 40 and s = 6. Find the z-score for each of the following X values from this sample.
X = 44, Z=
X = 42, Z=
X = 46,
X = 28, Z=
X = 50, Z=
X = 37,
Chapter 5 #12
A score that is 6 points below the mean corresponds to a z=score of z = -0.50. What is the population standard deviation?
Chapter 5 #14
For a population with a standard deviation of σ = 8, a score of X = 44 corresponds to z = -0.50. What is the population mean?
Chapter 5 #26
A sample consists of the following n = 6 scores:
2, 7, 4, 6, 4, and 7
a. Compute the mean and standard deviation for the sample.
b. Find the z-score for each score in the sample.
In the original distribution, X = 2, what is the new X value once transformed to a distribution with M = 50 and s = 10?
In the original distribution, X = 7, what is the new X value once transformed to a distribution with M = 50 and s = 10?
In the original distribution, X = 4, what is the new X value once transformed to a distribution with M = 50 and s = 10?
In the original distribution, X = 6, what is the new X value once transformed to a distribution with M = 50 and s = 10?
Why Work with Us
Top Quality and Well-Researched Papers
We always make sure that writers follow all your instructions precisely. You can choose your academic level: high school, college/university or professional, and we will assign a writer who has a respective degree.
Professional and Experienced Academic Writers
We have a team of professional writers with experience in academic and business writing. Many are native speakers and able to perform any task for which you need help.
Free Unlimited Revisions
If you think we missed something, send your order for a free revision. You have 10 days to submit the order for review after you have received the final document. You can do this yourself after logging into your personal account or by contacting our support.
Prompt Delivery and 100% Money-Back-Guarantee
All papers are always delivered on time. In case we need more time to master your paper, we may contact you regarding the deadline extension. In case you cannot provide us with more time, a 100% refund is guaranteed.
Original & Confidential
We use several writing tools checks to ensure that all documents you receive are free from plagiarism. Our editors carefully review all quotations in the text. We also promise maximum confidentiality in all of our services.
24/7 Customer Support
Our support agents are available 24 hours a day 7 days a week and committed to providing you with the best customer experience. Get in touch whenever you need any assistance.
Try it now!
How it works?
Follow these simple steps to get your paper done
Place your order
Fill in the order form and provide all details of your assignment.
Proceed with the payment
Choose the payment system that suits you most.
Receive the final file
Once your paper is ready, we will email it to you.
No need to work on your paper at night. Sleep tight, we will cover your back. We offer all kinds of writing services.
No matter what kind of academic paper you need and how urgent you need it, you are welcome to choose your academic level and the type of your paper at an affordable price. We take care of all your paper needs and give a 24/7 customer care support system.
Admission Essays & Business Writing Help
An admission essay is an essay or other written statement by a candidate, often a potential student enrolling in a college, university, or graduate school. You can be rest assurred that through our service we will write the best admission essay for you.
Our academic writers and editors make the necessary changes to your paper so that it is polished. We also format your document by correctly quoting the sources and creating reference lists in the formats APA, Harvard, MLA, Chicago / Turabian.
If you think your paper could be improved, you can request a review. In this case, your paper will be checked by the writer or assigned to an editor. You can use this option as many times as you see fit. This is free because we want you to be completely satisfied with the service offered.