Math 1040
Last Modified: 20170213
Sunset or some of a population.
^Randomization
*Control
Voluntary response sample to check people who feel strongly about this you think question and may not fairly represent the opinions of the entire population.
1. each entry and the table is equally likely to be of any of the 10 digits
2. the entries are independent of each other. That is knowledge of one part of the table gives no information about any other part
2. software or table. Use random digit to select labels at random.
Statistic
Sample proportion
P=full census but with ^ it is statistic.
Short answer: + or  2 %
Margin of error and level of confidence
For example: "we are 95% confident that between 49% and 53% of all adults favor such an amendment. "
The conclusion of a confidence statement always applies to the population, not to the sample.
Conclusion is never completely certain
Can choose to use a confidence level other than 95%
Ex. Flipping coin 4x getting 25% heads
Ex. Typo, math error
Dishonesty
Forget or bad memory
Not understand the question
Guesses
Unable to contact or refuses to answer.
This is the most serious problem facing sample surveys.
Step two. Take a separate SRS in each Stratum and combine these to make up the complete sample
This kind of sample need not all individuals same chance to be chosen.
Produces groups of subjects that are similar
2.
Three or more
Two
Phenomenon of fake treatment can improve patient bcz of expectation it will be helpful.
Institutional Review Board
Systematically wrong in the same direction
To reduce use better instrument
 compute
 the
 difference between each observation
 in
 the
 mean
 and square each of these differences

 average the square differences by dividing
 are
 some
 by
 and
 1.
 This
 average
 square
 difference is the va
 riance
I reliable measurement process will have a small variance
Pie chart or bar graph
Best used for categorical variables
Only displays quantities that are part of a whole
Best used for categorical variables
Can't compare quantities that are not part of the whole
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