# Test 1

- StudyBlue
- Pennsylvania
- West Chester University of Pennsylvania
- Mathematics
- Mathematics 121
- Pyott
- Test 1

**Created:**2017-02-16

**Last Modified:**2017-05-11

measure from a sample

ex) persons gender

measure of count

time, distance,

can have decimal

**Empirical Rule**

If the data distribution is bell-shaped, then the interval

μ ± 1σ contains approximately 68% of the values

μ ± 2σ contains approximately 95% of the values

μ ± 3σ contains virtually all of the data values (99,7)

cant occur at the same time

^

p --> "p hat"

when x bar < mu skewed left

when x bar = mu symmetric

formed by combining 2 events

variable that is related to both the treatment and the outcome

the degree to which a procedure systematically over or under estimates a population value

p(not 20)= 1-p(20)

1-.17=.83

of an event is the proportion of times that the event occurs in the long run as an experiment is repeated over and over again as it gets closer to 1, more likely it will occur

always between 0 and 1

when probability is 1

= sigma / mu

68, 99, 99.7

1 2 3 sd + or - away from mean

- no expectation of data for (m±σ)
- 75% (m±2σ)
- 89% (m±3σ)

Q1-1.5xIQR

upper fence

Q3+1.5xIQR

**population**

**sample**

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