Two-sample hypothesis testing, II
... • Sometimes, either theoretically, or from the data, it may be clear that this is not a good assumption. • Note: the equal-variance t-test is actually pretty robust to reasonable differences in the variances, if the sample sizes, n1 and n2 are (nearly) equal. – When in doubt about the variances of y ...
... • Sometimes, either theoretically, or from the data, it may be clear that this is not a good assumption. • Note: the equal-variance t-test is actually pretty robust to reasonable differences in the variances, if the sample sizes, n1 and n2 are (nearly) equal. – When in doubt about the variances of y ...
Chapter review guide
... - Finding probability for x and mean of x - point estimate vs confidence interval for population mean - margin of error - use of t Table - how to calculate (formula) confidence interval (expression) using t or z; when to use which - how to interpret (inferential!) - Hypothesis test for population me ...
... - Finding probability for x and mean of x - point estimate vs confidence interval for population mean - margin of error - use of t Table - how to calculate (formula) confidence interval (expression) using t or z; when to use which - how to interpret (inferential!) - Hypothesis test for population me ...
A consumer advocacy group suspects that a local supermarket`s 10
... households in the United States planned to spend on gifts, decorations, greeting cards, and food during the 2015 holiday season was $1040. Suppose that a recent random sample of 24 households showed that they plan to spend an average of $1105 on such items during this year’s holiday season with a st ...
... households in the United States planned to spend on gifts, decorations, greeting cards, and food during the 2015 holiday season was $1040. Suppose that a recent random sample of 24 households showed that they plan to spend an average of $1105 on such items during this year’s holiday season with a st ...
1342Lecture8.pdf
... Accordingly, we reject H 0 . There is not enough evidence to conclude that the plants from the space-borne seeds come from a population of plants where the mean height equals five millimeters. Accordingly, we suspect that the plants from space-borne seeds come from a population whose mean height is ...
... Accordingly, we reject H 0 . There is not enough evidence to conclude that the plants from the space-borne seeds come from a population of plants where the mean height equals five millimeters. Accordingly, we suspect that the plants from space-borne seeds come from a population whose mean height is ...
Confidence Interval
... Calculate a 99% confidence interval for the proportion of teachers who felt that computers are an essential teaching tool. How could the survey be changed to narrow the confidence interval but to maintain the 99% confidence interval.» ...
... Calculate a 99% confidence interval for the proportion of teachers who felt that computers are an essential teaching tool. How could the survey be changed to narrow the confidence interval but to maintain the 99% confidence interval.» ...
Quarter 2 Exam Review Sheet:
... a) Sample Mean = _____ b) Standard Deviation = _____ c) Use Chebyshev’s Theorem to find an interval centered about the mean in which you would expect 93.8% of the data to fall. d) Use Chebyshev’s Theorem to find an interval centered about the mean in which you would expect 99% of the data to fall. e ...
... a) Sample Mean = _____ b) Standard Deviation = _____ c) Use Chebyshev’s Theorem to find an interval centered about the mean in which you would expect 93.8% of the data to fall. d) Use Chebyshev’s Theorem to find an interval centered about the mean in which you would expect 99% of the data to fall. e ...
