AP Statistics 2017

of larger samples are less variable than sample means of small samples. However, it is often expensiv ...

Let M be the desired maximum margin of error. Then, Solving for n , But we do not have a value of until we ...

If . You need a sample of at least 1068 customers. By using P * = 0.6, the company was able t ...

removed from expected as we got. A decision about significance can then be made by comparing the ...

confirm by rejecting the null hypothesis. The alternative hypothesis is symbolized by H (^) A or H (^) a. There are ...

average toss, based on 50 throws, was 47.5 yards, and we assumed the population standard deviation was the same ...

Note that, in statistics, the term “error” does not mean somebody did something wrong. It refers to varia ...

Exam Tip: You will not need to know how to actually calculate P(Type II error ) or the power of ...

(d) The probability that the company will change its delivery procedures (e) The probability that t ...

population proportion, we will use P * = 0.5. Then, You would need a minimum of 385 subjects for your ...

Which of the following will increase the power of a test? a. Increase n . b. ...

mean. III. We are 99% confident that the true mean weight loss for this program is between 1.3 lb ...

a. H 0 : μ = 400, H (^) A : μ > 400 b. H 0 : μ ≥ 400, H (^) A : μ ≠ 400 c. H ...

used for the study. Assuming that the population from which the sample is drawn is approximately normal, wh ...

Construct a 99% confidence interval for the true difference between the mean score for males and the mean ...

the true mean differs from 190 hours. Do not actually carry out the complete test, but do state the null ...

The correct answer is (e). P = 0.7, M = 0.05, z * = 1.96 (for C = 0.95) . You need a sample ...

Free-Response C = 0.90 z * = 1.645, . You would need to survey at least 271 students. The popu ...

Since we do not know σ , but do have a large sample size, we will use a t procedure. , df ...

9. The conditions are present to construct a one-proportion z interval. We are 95% confident that the true propo ...