Term 1 L8: Descriptive Stats

Question 1

two types of stats DS and IS

Answer 1

descriptive stats (describing populations nad samples 
Central tendency 
- mean 
-median 
-mode 

Dispersions

• ranfe
• variance
• SD

Inferential statsitics drawing conclusions about a popialtion based on data obtained from a sample

Question 2

continuous and discrete variables

Answer 2

DVs onky take a countable nubmer of usually whole nubmers (nominal ordinal)

continous variables can take any value within thier range including fractions they are measured on a continuum (interval ratio)

Question 3

measures of central tendancy

Answer 3

Mean
Median
Mode

Question 4

Mean

Answer 4

the average

the total divided by the nubmer of scoires

interval and ratio (not meanigful for nominal or ordinal although tecchincally possible)

Question 5

median

what level

Answer 5

the middle value

splits the distriution into two qual parts so that 50% of the values are above the median and 50% are below the median

can be oibtained for ordinal interval and ration vairalbe ut not nominal as they cannot be ranked

Question 6

Mode

Answer 6

most Hz occuring value

only measure of central tendancy that can be used for nominal data

there can be more than one mode

Question 7

Measures of dispersion

Answer 7

range
variance
sd

Question 8

Range

Answer 8

differnce between the max and the min vlaue

used with ordinal interval nad ration varianles

Question 9

variance

The sum of the __ from the mean divided by the __

Answer 9

measures disperion based on the deviations of scores from teh mean

The sum of the squared deviations from the mean divided by the population size

The average of the squared deviations

can be calaculate for interval nad ration variables

Question 10

standard deviation

Answer 10

the square root of the variance the average deviation of values from the mean

can be calcualted for interval and variable rations