1. A relative measure of dispersion
2. Adjusts for differences in magnitudes of the means.
3. Does not have units of measure
4. Allows for direct comparisons of mean-adjusted dispersion across different data sets.

Percentiles and quartiles

Coefficient of determination
The proportion of variation in the dependent variable ”explained” by the independent variable.

Ex. Monthly income how much u spend on grocery, coefficient of determination 81%of your grocery billi being
19:% is not being explained(for reason we don’t know)
Maybe holiday month, having food, people….etc
Unexplained situation

CV fund 1 S/x=1.51
CV fund 2 S/x=1.30
Conclusion: Fund1 has greater relative dispersion than fund2

CH5.
Be familiar with the terms (different types of collect data) 1) Direct observation
2) Experiments
3) Survey
4) Telephone interviews
5) Self administered survey
--------------------------------------------------------------------------------------- Slope rise/run, y/x
B1=2.25 2.25/1 = y/x
Every 1 unit 2.25 cents

B1=0.3 0.3/1=y/x
Slope intercept b0=9.5

Data collection
1) Simple random sampling everyone has equal chance)
2) Stratified random sample (is supposed to be the most precise sampling, it doesn’t always work that way) Ex. 2008 election year, elected Obama, stratified sample it picked Obama as the winner, Hilary Clinton 3%, ex. 4 men 4 women

how? Divide take random sample

a cluster sample (save you money when u got large group to do it) Ex. Government use
randomly select some zip code
randomly selec out of my zip code
from this to that will do simple random sample
convenient sample

...think about 1000 radial stations are required for a converged calculation.
2) The first plot is of a rotor with linear twist showing the lift coefficientvariation with rbar in hover. The second plot is the lift coefficient max along the radius which looks to be about 1.2.
The maximum thrust of the rotor in hover in terms of thrust coefficient is 0.0183.
Cpo = 2.5668e-004
Cpi = 0.0020
Cpt = 0.0022
Cpideal =...

...Homework 1 Due Monday, September 17th at the beginning of class. Show your work. 1. Match the diﬀerential equation in (a)-(c) to a family of solutions in (d)-(f). The point of this exercise is not to solve the diﬀerential equations in a) - c). (a) y = y 2 (b) y = 1 + y 2 (c) yy = 3x (d) y = tan(x + C) (e) 3x2 − y 2 = C (f) y = −1/(x + C)
2. Find the value of k so that y = e3t + ke2t is a solution of y − 2y − 3y = 3e2t . 3. Solve the following diﬀerential equations and IVP’s. You may solve...

...the Pearson Correlation Coefficient (r)
The Pearson product-moment correlation coefficient (r) assesses the degree that quantitative variables are linearly related in a sample. Each individual or case must have scores on two quantitative variables (i.e., continuous variables measured on the interval or ratio scales). The significance test for r evaluates whether there is a linear relationship between the two variables in the population. The appropriate correlation...

...Variations in Humans
Aim: To find the differences in human size from measurement
Apparatus: Seven to five friends, measuring tape
Method:
1. Choose five/seven friends
2. Take height of each person
3. Record data in appropriate manner
4. Process data collected
5. Make evaluation
Observation: The males in most case were taller than the females and had a general height of 5 feet 8 inches, while the females remained in the area of 5 feet and 1 inch to 5 feet...

...CHEM 28.1
Experiment 1 – Application of Statistical Concepts in the Determination of Weight Variation in Samples
BANGAYAN, John Carlo B
2011-39545
BS Materials Engineering
Co-worker: Cervantes, Kerr
RESULTS AND DISCUSSION
Table 1. Weight of Samples
Sample
Weight
1
5.3380 g
2
5.3804 g
3
5.3580 g
4
5.5058 g
5
5.4045 g
6
5.3998 g
7
5.4030 g
8
5.4743 g
9
5.5249 g
10
5.4220 g
Data Set 1
Data Set 2
The Standard...

...Though he promised to work with Congress, the President also made clear that he would search for ways to go around them "whenever and wherever I can" if they do not cooperate. The President mentioned the College Opportunity Summit, which DSpar attended, to work on making college education a reality for all students. The President then received a thumbs up from Speaker Boehner after a reference to his humble beginnings as a barkeep's son. Boehner sat stone-faced the rest of the night.
Obama...

...x)(a + x)(a + x)(a + x) = a4 +4a3x +6a2x2 +4ax3+ x4
Method 2 - PASCAL Triangle
Pascal's triangle is a triangular array of the binomial coefficients in a triangle. It is named after the French mathematician Blaise Pascal
Base on algebra method.
only using the coefficients of terms.
Power value Coefficient
n = 0 1
n = 1 1 1
n = 2...

...
Coefficient of Friction- Post Lab
Abstract
The purpose of the experiment was to determine to coefficient of friction on a block sliding across a horizontal plane, and on the same block sliding down an inclined plane. This was done by first testing block, and how much weight on a string was needed to move the block at a constant velocity using a pulley system. The block weighed 0.2385 kilograms, and needed a hanging mass of 0.05 kg to move at a constant...

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