AP Stats 10.1 & 10.2 Rdg Quiz

True or False: This interval is called a one-sample z interval for a population mean .

• True

• False

True or False: The critical value in this interval is denoted t∗ because it comes from a t distribution, not the standard Normal distribution.

• True

• False

Which table is used to find the critical value t*?

• Table A

• Table B

• Table C

• Table D

If the correct df isn’t listed, use the greatest df available that is __________ than the correct df.

• greater

• less

Select all that apply: CONDITIONS FOR CONSTRUCTING A CONFIDENCE INTERVAL ABOUT A MEAN

• Normal/Large Sample: The population has a Normal distribution or the sample size is large (n≥30). If the population distribution has unknown shape and n<30, use a graph of the sample data to assess the Normality of the population. Do not use t procedures if the graph shows strong skewness or outliers.

• 10%: When sampling without replacement, n<0.10N.

• Normal/Large Sample: np<10 and n(1-p)<10.

• Random: The data come from a random sample from the population of interest.

True or False: It is is enough just to make a graph of the data on your calculator when assessing Normality. You don't have to sketch the graph on your paper to receive credit. You don’t have to draw multiple graphs—any appropriate graph will do.

• True

• False

Select all the apply: CONDITIONS FOR CONSTRUCTING A CONFIDENCE INTERVAL ABOUT A DIFFERENCE IN MEANS

• Random: The data come from two independent random samples or from two groups in a randomized experiment.

• 10%: When sampling without replacement, n1<0.10N1and n2<0.10N2. 10%: When sampling without replacement, n1<0.10N1and n2<0.10N2.

• Normal/Large Sample: For each sample, the corresponding population distribution (or the true distribution of response to the treatment) is Normal or the sample size is large n≥30 . For each sample, if the population (treatment) distribution has unknown shape and n<30 , a graph of the sample data shows no strong skewness or outliers.

When calculating a confidence interval for a difference of mean, which test is used?

• two-sample z interval for a difference between two means

• 1-sample t interval for a difference between two means

• two-sample t interval for a difference between two means

• 1-sample z interval for a difference between two means

______ data result from recording two values of the same quantitative variable for each individual or for each pair of similar individuals.

True of False: To analyze paired data, start by computing the difference for each pair. Then make a graph of the differences. Use the mean difference and the standard deviation of the differences as summary statistics.

• True

• False