the United States, a similar association may not exist in the United States.
E. People who want to avoid depression should consider drinking green tea on a daily basis.
A polling company wants to estimate, using a 95% confidence interval, the proportion of likely
voters that would vote for a particular candidate in the upcoming presidential election. Of the
following choices , which is the smallest sample size that will ensure a margin of sampling error
less than or equal to 2 percentage points?
A. 250
B. 950
C. 1,150
D. 2,250
E. 2,450
- The director of a local food bank asks for data on all donations given during the month of
November. Of the 100 checks received, the average donation is $155 with a standard deviation of
$32. Which of the following is the most appropriate statement?
A. This November, the average donation is $155.
B. 50% of all donations this November are more than $155.
C. We are 95% confident that the average donation in November is between about $91 and $219.
D. We are 95% confident that the average donation in November is between about $149 and $161.
E. This November, about 95% of all donations are between $91 and $219. - A multiple-choice test has 30 questions, and each question has five options. A student has not
studied and will guess on every question. Which calculation shows how to find the probability of
getting between 15 and 20 (inclusive) questions correct?
A.
B.
C. 0.2^15 0.8^15 + 0.2^16 0.8^14 + ... + 0.2^20 0.8^10
D. Use the normal approximation to find .E. Use the normal approximation to find .
Claire and Max each created a simulated sampling distribution for a test statistic. They each used
samples of size 4 from a normal population with the same mean m and standard deviation s . Claire
simulated the sampling distribution of and Max simulated the sampling distribution of ,
where s is the sample standard deviation.