maths

Question 1

strengths of mean

Answer 1

most common measure and can be more representative as it uses all scores in the data set

Question 2

weakness of mean

Answer 2

misleading if there’s extreme variables

Question 3

strength of median

Answer 3

based on the order, so its not distorted by extreme variables

Question 4

weakness of median

Answer 4

doesn’t take into account each participant individual score

Question 5

strength of mode

Answer 5

only measure suitable for summarising category

Question 6

weakness of mode

Answer 6

no modal value for many data sets or their may be several

Question 7

measures of central tendency?

Answer 7

mean, median

Question 8

measures of central dispersion?

Answer 8

range, dispersion, variance, standard deviation

Question 9

range?

Answer 9

+1

Question 10

how to calculate the standard deviation

Answer 10

mean of dataset, subtract mean from each dataset item, square the result, add up new values, divide by n-1, square root

Question 11

when are bar charts used

Answer 11

compare differences between two scores or conditions

Question 12

when is a histogram used

Answer 12

if the data is continuous

Question 13

when is a scattergraph used

Answer 13

display the relationship between 2 variables

Question 14

when is a line graph used

Answer 14

show behaviour over time

Question 15

pie charts?

Answer 15

proportion

Question 16

nominal data?

Answer 16

categories or frequency eg. pets- dog, cat, bird

Question 17

ordinal data?

Answer 17

ordered or ranked eg. 1st,2nd, 3rd

Question 18

interval data?

Answer 18

measured on a scale where each point has equal intervals eg. weight, height, age

Question 19

positive distribution?

Answer 19

skewed to the left

Question 20

p<0.05

Answer 20

accept alternate and rejected null

Question 21

type 1 error?

Answer 21

accepting alternate hypothesis although really the null was true

Question 22

type 2 error?

Answer 22

accepting null when alternate was true