Question: The confidence interval given in Exercise 2 is based on
The confidence interval given in Exercise 2 is based on df = 39, which is the “smaller of n1 — 1 and n2 — 1.” Use Formula 9-1 to find the number of degrees of freedom. Using the number of degrees of freedom from Formula 9-1 results in this confidence interval: 11.65 cm < µ1< µ2< 17.28 cm. In what sense is “df = smaller of n1 — 1 and n2 — 1” a more conservative estimate of the number of degrees of freedom than the estimate obtained with Formula 9-1?
Answer to relevant QuestionsWe sometimes know the value of one population standard deviation from an extensive history of data, but a new procedure or treatment results in sample values with an unknown standard deviation. If σ1 is known but σ2 is ...Listed below are body temperatures of four subjects measured at two different times in a day (from Data Set 3 in Appendix B). Assume that you want to use a 0.05 significance level to test the claim that paired sample data ...Is Friday the 13th Unlucky? Researchers collected data on the numbers of hospital admissions resulting from motor vehicle crashes, and results are given below for Fridays on the 6th of a month and Fridays on the following ...Speaking Couples Use the data in the first two columns of Data Set 17 in Appendix B. Those columns list the numbers of words spoken in a day by each member of 56 different couples. Use a 0.05 significance level. Use the ...Example 1 in this section included results from a study of the effects of color on creativity, and the results below were used to study the effects of color on cognition. Words were displayed on a computer screen with ...
Post your question