# the platium gasaver national f

the platium gasaver national fuelsaver corporation naufacturesthe platinum gasaver, a device they claim “may increase gas mileageby 22%” in an advertisment published in the des moines register,the gas mileages with and without the device were presented for 15″identical” 5- liter vehicles. the percent changes in gas mileagefor the vehicles were calculated and are presented here:

48.3 46.9 43.8 44.6 40.2 38.5 34.6 33.7

28.7 28.7 24.8 10.8 10.4 6.9 -12.4

The 12.4% decrease is gas mileage is an outlier in this dataset

(a) find the mean x(with line over it) and the standarddeviation s.

(b) find x(with line over it) and s for the 14 observations thatremain when you ignore the outlier. How does the outlier affect thevaules of x(with libe of it) and s?

(c) what do you think the advertisement means when it callsthese vehicles “identical”

BOOK: THE PRACTICE OF BUSINESS STATISTICS USING DATA FORDECISONS

MOORE, McCABE, DUCKWORTH, ALWAN

SECOND EDITON

PAGE 46 1.61

a ) let’s use excel for calculation

First enter the given dataset in the excel column.

Then click on Data >ata Analysis >>> DescriptiveStatistics >>>OK

Then select the range of the dataset

Look the following image:

Then click on OK, so we get the following output:

from the above output, we get

= 28.566667

s = 17.5642

Let’s find outliers.

If the value of the given dataset outside ( – 2*s ,   + 2*s ) this interval then we say that it is outliers.

( – 2*s ,   + 2*s ) = ( 28.566667 – 2*17.5642 , 28.566667 +2*17.5642) = (-6.56173 , 63.69507)

Only one data value is outside this interval as -12.4

So that -12.4 is an outlier.

b) Let’s find mean and standard deviation after deleting-12.4

Look the following output

Note that -12.4 is smallest value among the given values.

So that the mean obtained from the 14 values after removingsmallest one is increases.

Also when we remove outlier then the variability in the datasetdecrease.

##### "Our Prices Start at \$11.99. As Our First Client, Use Coupon Code GET15 to claim 15% Discount This Month!!"
Calculate the price
Pages (550 words)
\$0.00
*Price with a welcome 15% discount applied.
Pro tip: If you want to save more money and pay the lowest price, you need to set a more extended deadline.
We know how difficult it is to be a student these days. That's why our prices are one of the most affordable on the market, and there are no hidden fees.

Instead, we offer bonuses, discounts, and free services to make your experience outstanding.
How it works
Receive a 100% original paper that will pass Turnitin from a top essay writing service
step 1
Fill out the order form and provide paper details. You can even attach screenshots or add additional instructions later. If something is not clear or missing, the writer will contact you for clarification.
Pro service tips
How to get the most out of your experience with brilliantassignmenthelp.com
One writer throughout the entire course
If you like the writer, you can hire them again. Just copy & paste their ID on the order form ("Preferred Writer's ID" field). This way, your vocabulary will be uniform, and the writer will be aware of your needs.
The same paper from different writers
You can order essay or any other work from two different writers to choose the best one or give another version to a friend. This can be done through the add-on "Same paper from another writer."
Copy of sources used by the writer
Our college essay writers work with ScienceDirect and other databases. They can send you articles or materials used in PDF or through screenshots. Just tick the "Copy of sources" field on the order form.
Testimonials
See why 20k+ students have chosen us as their sole writing assistance provider
Check out the latest reviews and opinions submitted by real customers worldwide and make an informed decision.
11,595
Customer reviews in total
96%
Current satisfaction rate
3 pages
Average paper length
37%
Customers referred by a friend
OUR GIFT TO YOU
15% OFF your first order
Use a coupon FIRST15 and enjoy expert help with any task at the most affordable price.
Claim my 15% OFF Order in Chat

## Sometimes it is hard to do all the work on your own

Let us help you get a good grade on your paper. Get professional help and free up your time for more important courses. Let us handle your;

• Dissertations and Thesis
• Essays
• All Assignments

• Research papers
• Terms Papers
• Online Classes