Paper 2 Flashcards

Question

what is a mode

Answer 1

the observation that occurs most frequently

Answer 2

isn't affected by extreme values | only average used with qualitative data

Answer 3

can be multiple modes or no modes

Answer 4

upper quartile - lower quartile

Answer 5

look at the values below the median

Answer 6

look at the values above the median

Answer 7

the basic idea is to find the average from the mean

Answer 8

1) turn on frequency 2) shift SETUP 3) press down 4) statistics 3 5) press ON 1 6) statistics 6 7) 1 variable 1 8) Type in values 9) press AC 10) press OPTN 11) Press 1-variable calc

Answer 9

for discrete data | frequency given by height of bars

Answer 10

for continuous data | frequency given by area of bars

Answer 11

frequency = frequency density x width

Answer 12

- frequency can only be used on the vertical axis when the groups have equal widths - when the class widths are equal, subtract the class boundaries to find the class widths - when the class widths aren't equal divide each frequency by the corresponding class width to give frequency density

Answer 13

- the data follows the curve closely but not exactly - mean median and mode - symmetry about the curve - 50% of values less than the mean and 50% greater

Answer 14

if the probability is less than the number read straight of the table, if the value is greater than the values minus the number form 1

Answer 15

the average of a set of data

Answer 16

- work out z-values - use the statistical table - to find the probability minus one from the other

Answer 17

standard deviation / sample size squared rooted

Answer 18

work out distribution work out z values minus the values

Answer 19

involves exploring arguments. a well constructed argument should involve: -robust evidence -correct reasoning -appropriate conclusion if an argument can't be cleared followed it maybe because its not expressed clearly enough

Answer 20

- use of emotive language - use of vague language - what knowledge does the author assume the reader has - is the argument contradictory - does the author make reasonable assumption - are too many assumptions made

Answer 21

one piece of data can be convincing but a range of Data needs to considered

Answer 22

- in a small sample steps are taken to achieve a representative sample to draw sensible conclusions - representative samples are used to enable testing to tale place but with minimal timing - if a particular group was not represented in the sample then any conclusion cannot be applied to any members of that particular group

Answer 23

- times scales and axes are starting points. this is chosen to be more effective in order to further their point - when interpreting a graph check that what appears to be shown is actually the case. conventions are that uniform scale starting from 0 are used

Answer 24

- if two events A and B are correlated then - it could be coincidental - A could cause B - B could cause A - a third factor could cause A and B - when two things appear to be linked they are said to be correlated. however correlation necessarily whether there is a causal link

Answer 25

- people can be highly selective of the data used to further support their point - once a reporter have made up their mind it is sometimes too easy to grasp supporting evidence and to ignore any contradictory evidence

Answer 26

- calculate the standard error | - a 95 % confidence interval means that 0.95 lies within 1.96 x the standard error of the mean sample

Answer 27

-2.58 , 2.58

Answer 28

-1.96 , 1.96

Answer 29

-1.64 , 1.64