1.4 - Distributions, introduction to experimental design and statistics

Question 1

Normal/gaussian distribution (2)

Answer 1

1. area under curve directly proportional to relative frequency of observations and their probability, p
2. describes many frequency distributions of continuous variables

Question 2

standard normal distribution rules (2)

Answer 2

1. mean of 0 and S.D of 1
2. area under curve = 1

Question 3

standard normal distribution calculation (2)

Answer 3

1. convert given range into numbers of standard deviations from the mean
   a. (lower range - mean) over S.D
   b. (upper range - mean) over S.D
2. find probability
   a. subtract probabilities (larger - smaller)
   b. pnorm(larger) - pnorm(smaller)

Question 4

H0 accepted and H0 true

Answer 4

correct

Question 5

H0 accepted and H0 false

Answer 5

type II error

Question 6

H0 rejected and H0 true

Answer 6

type I error

Question 7

H0 rejected and H0 false

Answer 7

correct

Question 8

power

Answer 8

probability with which we correctly reject H0

Question 9

degrees of freedom

Answer 9

number of independent observations minus number of parameters we estimated from data

Question 10

writing up results

Answer 10

look at onenote