# As below | Statistics homework help

So far in this course, you have learned how to run a hypothesis test about a population mean using the z-test. In the examples you were given the population standard deviation or the sample size was greater than 30. Usually you do not know the population standard deviation and with samples sizes less than approximately 30 you will do a better job testing a mean if you use a t-test.

For example, suppose NASA decides it wants to invest in a new rocket to send into space. When NASA investigates the costs or effectiveness of its rocket ship launches, it needs to figure out how to get reliable data out of only a few past launches.

In cases like this, you must use a test that does not require knowing the population standard deviation but still allows you to calculate statistics such as confidence intervals and margin of error. This is where the t test comes into play.

This week, you’ll learn how to use the t distribution to create confidence intervals and run a hypothesis test on a population mean with a small set of data values and when the population standard deviation is not known. You will also work with qualitative variables and run hypothesis tests on two-way tables.

## Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
\$26
The price is based on these factors:
Number of pages
Urgency
Basic features
• Free title page and bibliography
• Unlimited revisions
• Plagiarism-free guarantee
• Money-back guarantee
On-demand options
• Writer’s samples
• Part-by-part delivery
• Overnight delivery
• Copies of used sources
Paper format
• 275 words per page
• 12 pt Arial/Times New Roman
• Double line spacing
• Any citation style (APA, MLA, Chicago/Turabian, Harvard)

# Our guarantees

Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

### Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

### Zero-plagiarism guarantee

Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

### Free-revision policy

Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.