standard error, confidence limits

Question 1

1 mean

Answer 1

x=total/n

Question 2

2 standard deviation

Answer 2

s=√∑(xi-mean)/n-1

Question 3

3 standard error

Answer 3

SE=s/√n

Question 4

4 confidence limits

Answer 4

CL= mean±(SE x 2)

Question 5

if they don’t overlap

Answer 5

there is a 95 % chance the means are different

reject null hypothesis