16 In a randomized comparative experiment on the effect of c

16. In a randomized comparative experiment on the effect of color on the performance of a cognitive task, researchers randomly divided 69 subjects (27 males and 42 females ranging in age from 17 to 25 years) into three groups. Participants were asked to solve a series of six anagrams. One group was presented with the anagrams on a blue screen, one group saw them on a red screen, and one group had a neutral screen. The time, in seconds, taken to solve the anagrams was recorded. The paper reporting the study gives x = 11.42 and s = 4.3 for the times of the 23 members of the neutral group.

Give a 95% confidence interval for the mean time in the population from which the subjects were recruited. (Round your answers to two decimal places.)

   ________to___________seconds

You may need to use the appropriate Appendix Table to answer this question. http://www.webassign.net/mbasicstat6/appendix-tables.pdf

Solution