Flashcards in 9.12 EBDM Basic Statistics Deck (31):

1

## Measure that pertains to the population, almost always unobservable. Characteristic of a population. Describes the entire population

### parameter

2

## Characteristic of a sample (measure based on a sample). We can use this to estimate a population parameter.

### statistic

3

## if there is a skew and the peak is to the right and the tail is to the left, it is a _____ skew

### left

4

## if there is a skew and the peak is to the left and the tail is to the right, it is a _____ skew

### right

5

## mean, median, and mode are measures of _______

### location

6

## range, inter-quartile range, variance, standard deviation are measures of ________

### dispersion

7

## how far the values are away from the mean. A larger _____ means more uncertainty

### variance

8

## square root of variance is _____

### SD

9

## repeated measurements give the same/similar results. is this reliability or validity?

### reliability

10

## when a tool measures what it is supposed to, the "truth" it is ______.

###
valid

concept of validity

11

## what is Intra-rater reliability

###
measure once by one person, measure again by same person and it is around the same

12

## what is inter-rater reliability?

### measure once by one person, measure again by another person - same/similar results

13

## temporal reproducibility:

### measure today, measure tomorrow, same/similar results

14

## do reliable results mean the data is valid?

###
no

15

## does a measure have to be reliable to be valid?

### yes

16

## there are two TYPES of measurement: what are they?

### categorical and continuous

17

## there are four LEVELS of measurement, what are they?

### nominal, ordinal, interval, ratio

18

## a nominal level of measurement is ________ (categorical or continuous?). What does it measure?

###
categorical

measures categories that have no order (occupation, gender, eye color, blood type)

19

## an ordinal level of measurement is _______ (categorical or continuous?). What does it measure?

###
categorical

measures categories that have an order/direction (pain - poor, excellent, OK.... size small, medium, large)

20

## an interval level of measurement is _______ (categorical or continuous?) what does it measure?

###
either categorical or continuous

data on a scale with an arbitrary 0 point and quantitative differences between two measurements (temperature, etc)

21

## in interval levels of measurement, is a ratio meaningful? is a range?

### a ratio is NOT meaningful and a range is.

22

## a ratio level of measurement is _________ (categorical or continuous?) what does it measure?

###
either categorical or continuous.

measures something with a true/absolute zero point where ratio between two is meaningful (blood pressure, weight, cholesterol)

23

## what level of measurement would you use for something that you think of as "twice as much, three times as much"

### ratio level of measurement

24

## on a scatterplot, you can see _______ between two variables

### correlation

25

## the LINEAR relationship between two variables on a scatterplot is called what?

### the correlation coefficient

26

## what are the two extremes of the correlation coefficient for a scatterplot?

### -1 to 1

27

## if there is no significant correlation coefficient for a scatterplot does that mean there is no correlation?

### NO, it could be a non-linear correlation

28

## ___________ is the technique to study if a dependent variable changes with an independent variable

### regression

29

## linear regression analysis can _______ dependent variable using the independent variable

### predict

30

## in ____________ analysis, one postulates the statistical model that two variables, X and Y are related by a straight line

### linear regression

31