L15 - Statistics 1

Question 1

sampling error

Answer 1

error that occurs when statistical characteristics of a population are estimated from a sample

Question 2

why is variation important in ecology?

Answer 2

distinguish natural variability from processes

Question 3

whats the difference between sample variance and Standard deviation

Answer 3

sample varience = s^2
stdev = s

Question 4

68/100 values in a normal distributed curve are _______

Answer 4

1 STDEV from the mean

Question 5

95/100 values in a normal distributed curve are _______

Answer 5

within 2 STDEV’s of the mean.

Question 6

what is the central limit theorem

Answer 6

the distribution of means of samples taken from a normally distributed population is also normal.

Question 7

what is standard error of the mean?

Answer 7

is estimated by dividing the sample standard deviation by the square root of the sample size.
sx = s/(n^1/2)