Normal (Z), T and binomial distributions Flashcards Preview

BMS1042: Biostatistics > Normal (Z), T and binomial distributions > Flashcards

Flashcards in Normal (Z), T and binomial distributions Deck (12)
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1
Q

2 other names for normal distribution

A

Z distribution

Gaussian distribution

2
Q

Describe

  • shape
  • symmetry
  • implications for mean, median and mode
A

bell shaped
symmetrical about the mean
mean=median=mode

3
Q

area under =

A

1

4
Q

are they appropriate for continuous or discrete varibales?

A

continuous

5
Q

what two statistics does it take into account?

A

pop mean

pop SD

6
Q

Z score formula

A

(value - pop mean)/pop SD

7
Q

what does Z score transform the normal dist into? in terms of mean and SD
implications

A

mean of 0
sd of 1
shows us how many sd’s the thing is away from the mean

8
Q

does t dist have similar properties to normal dist

A

yes

9
Q

2 differences in shape of t dist

A

bell is flatter

tails are longer

10
Q

what additional factor does t distribution take into account

A

degrees of freedom

11
Q

the more degrees of freedom/bigger the sample size

A

the more normal the normal dist becomes

12
Q

describe binomial distribution

A

looks at two mutually exclusive events with known probabilities
looks at the probability of either event occuring X times