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STATs 1221 > Panic > Flashcards

Panic Flashcards

1
Q

Measures of central location

A

mean median and mode

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2
Q

Measures varibility

A

Range and standard deviation

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3
Q

Measures of position

A

percentiles, ranks, and Z-scores

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4
Q

standard deviation (sample)

A

sqrt(sum of (x-xbar)^2/(n-1))

or

sqrt(sum of (x^2)-(1/n) (sum of (x))^2 all dividied by (n-1))

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5
Q

standard deviation (population)

A

sum of (x-xbar)^2/(n)

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6
Q

calculate position of percentile

A

position = (percentile/100) times population size

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7
Q

find percintile rank

A

num of vaules below or equal to 6 divided by total number of vaules

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8
Q

five number summary

A

min q1 q2 q3 max

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9
Q

IQR

A

q3 - q1

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10
Q

z scores

A

x-avergare/deviation

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11
Q

z scores to vaule

A

average + zscore times standard deviation

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12
Q

empirical rule

A

1 SD = 34 + 34
2 SD = 1SD + 13.5 + 13.5
3 SD = 2SD + 2.35 + 2.35
4 SD = 3SD + 0.15 + 0.15

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13
Q

chebsehv

A

1 SD = unkown
2 SD = 3/4
3 SD = 7/8
4 SD = 1- 1/(standard deviation^2)

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14
Q

sample space

A

set of all possible outcomes

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15
Q

an event

A

a subset of sample space

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16
Q

rules of probability

A

always between 0 and 1
sum of all probabilities = 1

17
Q

complements

A

1- probability of event = evetn compliment

18
Q

Intersect of events A and B

A

prob(A) times prob(B)

19
Q

Union of events A nd B

A

Prob (A) + Prob (B) - Intersect of events A and B

20
Q

Mutual exclusive events

A

Intersect of events A and B = 0

21
Q

Conditional events P (A|B)

A

Intersect of events A and B / P(B)

22
Q

Independant events

A

Intersect of events A and B = P(A) time P (B)

23
Q

Sampling with replacement

A

The randomly selected unit is returned to the population after being selected. When
sampling with replacement, it is possible for the same unit to be sampled more than
once.

24
Q

Sampling without replacement

A

the randomly selected unit is not returned to the population after being selected.
When sampling without replacement, it is not possible for the same unit to be
sampled more than once

25
Q

Mean of discrete probability distributions

A

sum of (x times p(x))

26
Q

SD of discrete probability distributions

A

(discrete probability distributions are always with populations)
sqrt ( sumof (x-average)^2 * P(x))

27
Q

binomial distribution

A

(n/x)p^x*q^(n-x)

28
Q

n/x

A

n!/(x!(n-x)!)

29
Q

what is x

A

ammount of succes

30
Q

what is n

A

ammount of trials

31
Q

what is p

A

succes rate

32
Q

what is q

A

failure rate

33
Q

binomial distribution average

A

P time Q

34
Q

binomial distribution SD

A

N time P times Q

STATs 1221 (7 decks)

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