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exam review Flashcards

1
Q

nominal variable

A

Defined catagories

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2
Q

Ordinal variables

A

ordered catagories

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3
Q

discrete variablr

A

counted items

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4
Q

continuous varible

A

measured characteristic

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5
Q

population

A

contains all of the items or indiviudals of interest that you seek to study

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6
Q

sample

A

contains only a portion of a population interest

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7
Q

population parameter

A

summarizes the value of a specific variable for a population

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8
Q

sample statistic

A

summarizes the value of a specific variable for sample date

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9
Q

startified sample

A

Drawn from random groups

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10
Q

Systematic sample

A

drawn from a big group

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11
Q

coverage error

A

some groups are excluded

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12
Q

Non response error

A

some people wont respond and their answer could differ

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13
Q

Sample error

A

variation from sample to sample will always exist

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14
Q

Measurement error

A

Due to weakeness in question design

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15
Q

WHat number of classes does the book reccomend

A

5-15

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16
Q

Pareto

A

first catagories are most important

17
Q

Left skew

A

mean < median

18
Q

symmetric

A

mean = median

19
Q

right skew

A

median<mean

20
Q

in ER how much date is within 1 SD of the mean

A

68%

21
Q

in ER how much date is within 2 SD of the mean

A

95%

22
Q

in ER how much date is within 3 SD of the mean

A

99.7

23
Q

Covariance is bigger thaN 0

A

Same direction

24
Q

Covariance is smaller than 0

A

opposite direction

25
Q

Covariance is equal to 0

A

X and Y are independent

26
Q

WHen is A and B inde

A

Based on prior knowledge of the process

27
Q

empiracle probability

A

Based on specific date

28
Q

SUbjective probability

A

Based on a combo of general date, personal opinion and anaylisis of a particular situation

29
Q
A

Stats (5 decks)

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