signal to noise ratios

Question 1

Signal to noise ratio

Answer 1

Account mean difference and SD
-how big mean difference between groups relative to variability of data.

Question 2

signal

Answer 2

difference in mean.

Question 3

noise

Answer 3

average variability.(noise or error)

Question 4

what does it mean if signal different to noise

Answer 4

real difference.

Question 5

T mean

Answer 5

signal to noise ratio

Question 6

Signal formula

Answer 6

mean(group 1)- mean(group 2.)

Question 7

Noise

Answer 7

SD(group 1)+ SD (group 2.)/2

Question 8

Therefore T value formula

Answer 8

Signal/noise

Question 9

when is T large

Answer 9

if mean difference is large and Variability is low
(sig difference)

Question 10

what does large t signalise

Answer 10

good signal to noise ratio

Question 11

Induction

Answer 11

larger t more confident sample representative to population

Question 12

T distribution(histrogram)

Answer 12

peak-frequent.
tail-infrequent.
(as is para)

Question 13

T distribution(p value)

Answer 13

to look at t results and find proability of getting value is p<0.05= lower 5% error it means its statistically sig.