2.measures of central tendencies

Question 1

Central tendencies

Answer 1

Mode,Mean and range of gather many individual samples to one number.

Question 2

normal distribution

Answer 2

In graphic forms a bell curve where most common results show Here most data points cluster to middle where rest to opposite extremes.

Question 3

Central limit theory

Answer 3

Collects lots of data from individual measures- This to gather central tendencies more accurately.-larger sample more representative because shows more population.
-based since assumption no one does exactly same thing, therefore large sample more accurate.(test-retest?)

Question 4

How to work out mean

Answer 4

sum of all scores divided by number of participants.

Question 5

Whats the equation(think symbol look like and meaning.)

Answer 5

u=3 x X/n and same population with X

Question 6

What effects mean

Answer 6

Outliers- far away from cluster.
-Skewed by extremities cause issues when calculating mean.

Question 7

Whats median

Answer 7

Rank lowest to highest and find middle number
-more resilient to outliers.
50percent above and below.

Question 8

Whats mode

Answer 8

Most common data value.

Question 9

What effects mode

Answer 9

Bimodal/multimodal- if more than one mode it shows not normally distributed as has more than one peak.
compared unimodal=normally distributed.

Question 10

Measures of variable(dispersion)

Answer 10

How far data points lie from each other and from center of distribution

Question 11

range can be done

Answer 11

as it shows smaller range less variability(dispersion)=normally distributed= predict info on population based on sample data set.
r=x(max)-x(min)

Question 12

Standard deviation

Answer 12

while variant is average sum of square SD= the square root of the mean of squares of all values

(SD measures how far apart numbers are in data set.)-avarage distance from mean.
(variance measure difference in data points to mean.)- squared avarage distance from mean

Question 13

SD equation

Answer 13

s=square root of e(x-mxor x with line)2(squared)/n-1=SAMPLE
EQUATION is same.

Question 14

SD mean=

Answer 14

measure var of data to mean, and set distributions score-LOW SD= close to avarage. HIGH SD- more disprese and p>0.05=null.
HELPS HYPOTHESIS.