Introduction to data analysis Flashcards
1
Q
What is meant by statistic
A
characteristic of a sample
2
Q
What is meant by a parameter
A
characteristic of a population
3
Q
How do you calculate variance
A
sum of (each value - mean)2 all divided by n - 1
4
Q
How do you calculate standard deviation
A
square root of the variance
5
Q
How do you calculate SEM
A
standard deviation divided by root n
6
Q
How do you calculate 95%CI
A
CI = mean +/- 1.96 multiplied by SEM
7
Q
What is meant by t-testing
A
if testing for a difference in both directions use a two-tailed test, and if the data are not paired, compare the variance to decide whether to use an equal or unequal variance test
