Quiz 3

Question 1

How do you calculate standard error of the proportion?

Answer 1

1. Calculate the proportion
2. SEP = SQRT(P*(1-P)/N)

Question 2

How do you calculate standard error of the mean?

Answer 2

1. SEM = S/SQRT(N)
   Where S = sample standard deviation

Question 3

How do you calculate margin of error for the mean?

Answer 3

T.test*Std.Dev/SQRT(N)

Question 4

How do you calculate margin of error for the proportion?

Answer 4

MEP = Z(SEP)
Where = SEP = SQRT(P(1-P)/N)

Question 5

What is the Z-score formula and T-test formula?

Answer 5

Z-score = norm.s.inv=(1-alpha/2)
T-test = t.inv.2t=(alpha,df)

Question 6

Test Stat Formula for Hypothesized Mean

Answer 6

=(Sample mean - hypothesized mean) / Sample Std / SQRT(N)
or Sample Mean - Hypothesized Mean / Standard Error

Question 7

P-Value Formula by Test

Answer 7

Lower Tail: T.Dist = (Test, df, true)
Upper Tail: 1-T.Dist = (Test, df, true)
Two-tail: T.Dist.Dt = (ABS(Test), df)

Question 8

Steps to calculate confidence interval of Mean

Answer 8

1. Average
2. Std.Dev
3. Count
4. Alpha
5. T-test = t.inv.2t(alpha,df)
6. Standard error of mean = Std.dev/SQRT(n)
7. Margin of error for mean = SE*T-test
8. Upper and lower limit = average +- ME

Question 9

Steps to calculate confidence interval of proportion

Answer 9

1. Proportion
2. Z-score = norm.s.inv(1-alpha/2)
3. Standard error of proportion = SQRT(P*(1-P)/N)
4. Margin of error of proportion = Z-score*SE
5. Upper and lower limit = Proportion +- ME