New User Special Price Expires in

Let's log you in.

Sign in with Facebook


Don't have a StudySoup account? Create one here!


Create a StudySoup account

Be part of our community, it's free to join!

Sign up with Facebook


Create your account
By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here

General Chemistry I

by: Annamae Beatty

General Chemistry I CHE 111

Annamae Beatty

GPA 3.95


Almost Ready


These notes were just uploaded, and will be ready to view shortly.

Purchase these notes here, or revisit this page.

Either way, we'll remind you when they're ready :)

Preview These Notes for FREE

Get a free preview of these Notes, just enter your email below.

Unlock Preview
Unlock Preview

Preview these materials now for free

Why put in your email? Get access to more of this material and other relevant free materials for your school

View Preview

About this Document

Class Notes
25 ?




Popular in Course

Popular in Chemistry

This 2 page Class Notes was uploaded by Annamae Beatty on Wednesday September 30, 2015. The Class Notes belongs to CHE 111 at Pace University - New York taught by Staff in Fall. Since its upload, it has received 10 views. For similar materials see /class/217117/che-111-pace-university-new-york in Chemistry at Pace University - New York.

Similar to CHE 111 at


Reviews for General Chemistry I


Report this Material


What is Karma?


Karma is the currency of StudySoup.

You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 09/30/15
Andrea Szczepanski Analytical Chemistry Fall 2001 Chapter 7 Statistical Analysis Evaluating the Data I Confidence Limits A Confidence limits define a numerical interval around x7 experimental mean that contains u the mean for a population with a certain probability B Confidence interval is the numerical magnitude of the confidence limit It is computed from the standard deviation and depends on how accurately we know s the sample standard deviation compared to o the population standard deviation In the absence of bias and assuming s the sample standard deviation is a good estimate of o the population standard deviation The confidence limit CL for a single measurement can be expressed by CL xi 20 The confidence limit for N measurements can be expressed by CL x7 i Q N square root In determining the confidence levels expressed as a percent we can examine the normal bell curve INSERT 5 Bell CURVES from PAGE 150 HERE and EXPLAIN Example 75 page 173 a 90 Confidence Limit 853 ug CumL i 164 X 032 ug CumL square root ofl 853 1053ug CumL 99 Confidence Limit 853 ug CumL i 258 X 032 ug CumL square root of 1 853 080ug CumL b 90 Confidence Limit 853 ug CumL i 164 X 032 ug CumL square root of 4 853 1026ug CumL 99 Confidence Limit 853 ug CumL i 258 X 032 ug CumL square root of 4 853 1040ug CumL c 90 Confidence Limit 853 ug CumL i 164 X 032 ug CumL square root of 16 853 0l3ug CumL 99 Confidence Limit 853 ug CumL i 258 X 032 ug CumL square root of 16 853 02lug CumL Andrea Szczepanski Analytical Chemistry Fall 2001 These concepts also apply when 0 is not known and we are dealing with a very small sample H Hypothesis Testing A The null hypothesis INSERT FURTEHR EXPLANATION 1 Comparisons of Experimental Mean a Comparing Experimental Mean with True Value HI Detecting Gross Errors A Outliers 7 data points that differ excessively from the mean in a data set B Retention or Rejection of Outliers 1 Q Test 7 the absolute value of the difference between the questionable result and its nearest value is divided by the spread of the entire set Qex 3 A P 9 W Q exp is then compared with rejection values Q m INSERT TABLE 73 page 158 Example 7l7 page 174 a Q exp 85107 8470 083 Q cm 0970 85107 8462 Q up ltQ cm RETAIN b b Q m 85107 8470 083 Q m 0829 85107 8462 Q up gt Q crit REJECT C Dealing with outliers in small sets of data 1 Reexamine all data relating to the outlying results to see if gross error could have affected its value This demands a properly kept lab notebook containing careful notations of all observations 2 If possible estimate the precision that can be reasonable expected from the procedure to be sure that the outlying result is actually questionable Repeat the analysis if sufficient sample and time are available If more data cannot be obtained apply the Q test to the existing set of data to see if the doubtful result should be retained or rejected on statistical ground 5 If the Q test indicates retention consider reporting the median of the set rather than the mean The median has the greater virtue of allowing inclusion of all data in a set without undue in uence from an outlying value In addition the median of a normally distributed set containing three measurements provides a better estimate of the correct value than the mean of the set after the outlying value has been discarded 5


Buy Material

Are you sure you want to buy this material for

25 Karma

Buy Material

BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.


You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

Why people love StudySoup

Bentley McCaw University of Florida

"I was shooting for a perfect 4.0 GPA this semester. Having StudySoup as a study aid was critical to helping me achieve my goal...and I nailed it!"

Allison Fischer University of Alabama

"I signed up to be an Elite Notetaker with 2 of my sorority sisters this semester. We just posted our notes weekly and were each making over $600 per month. I LOVE StudySoup!"

Steve Martinelli UC Los Angeles

"There's no way I would have passed my Organic Chemistry class this semester without the notes and study guides I got from StudySoup."


"Their 'Elite Notetakers' are making over $1,200/month in sales by creating high quality content that helps their classmates in a time of need."

Become an Elite Notetaker and start selling your notes online!

Refund Policy


All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email


StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here:

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.