AP Stats Inference

If the sample size is 500 and the standard error is 0.0219 for a one sample Z interval for population proportions. Which could be the point estimate, rounded to the nearest tenth? (SELECT ALL)

• 0.4

• 0.5

• 0.6

• 0.7

Two Sample Z Interval for Difference in Population Proportions (-0.03 , 0.07) Is the difference between the proportions statistically significant?

• NO

  Zero is not on the interval

• YES

  Zero is not on the interval

• NO

  Zero is on the interval

• YES

  Zero is on the interval

Two Sample Z Interval for Difference in Population Proportions ( 0.03 , 0.07 ) Is the difference between the proportions statistically significant?

• NO

  Zero is not on the interval

• YES

  Zero is not on the interval

• NO

  Zero is on the interval

• YES

  Zero is on the interval

Two Sample Z Interval for Difference in Population Proportions Is the difference between the proportions statistically significant?

• NO

  Zero is not on the interval

• YES

  Zero is not on the interval

• NO

  Zero is on the interval

• YES

  Zero is on the interval

To the nearest tenth, what is the MEAN of the sampling distribution that is behind our calulations for a One Sample Z Interval for Population Proportion, WHEN p-hat is 0.4 and n = 200 ?

To the nearest hundreth, what is the STANDARD DEVIATION of the sampling distribution that is behind our calulations for a One Sample Z Interval for Population Proportion, WHEN p-hat is 0.4 and n = 200 ?

Why do we check to see if n x p and n x ( 1-p ) are both greater than or equal to 10? Note: for confidence intervals it is actually n x p-hat and n x ( 1 - p-hat )

• To make certain that the selection for the sample are independent

• To check if it is reasonable to assume population is approximately normal.

• To check if the sample is unimodal and symmetric.

• To check if it is reasonable to assume the sampling distribution of sample proportions is approximately normal.

• A

• B

• C

• D

• E

• A

• B

• C

• D

• E

• A

• B

• C

• D

• E