Statistics Estimation

Question 1

CI for population mean?

Answer 1

CI95= mean + or - (t n-1) SEM

•perform both + and - so you get lower and upper CI
df= n-1 then read value on t table

95 is reliability value 5 is error risk

Question 2

Point estimation?

Answer 2

Estimates a single variable
•dependent on number of variables

Question 3

Interval estimation?

Answer 3

Two numbers that the value can be estimated with probability in the interval

Question 4

What can be used to correct for confidence?

Answer 4

T-distribution by applying Degree of freedom (df) which is n-1

Question 5

For a large sample what do you use for CI?

Answer 5

Z instead of t

Question 6

Difference between t and normal distribution (z distribution)

Answer 6

T gives more probability of observations in the tail region

Question 7

How does t difference affect curve?

Answer 7

Big t diff. — small area under the curve

Question 8

Association between t calculated and t table?

Answer 8

If t table > t calculated, p is small.
so : p<alpha reject H0

Question 9

Difference between CI and hypothesis testing?

Answer 9

CI uses sample data to estimate population parameters
Hypothesis uses sample data to test specific hypotheses