Group Means Std. 10.412 9.47 7.97 Devs. 2.43 2.04 1.52 Reading highway signs is
ID: 3158403 • Letter: G
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Group Means Std. 10.412 9.47 7.97 Devs. 2.43 2.04 1.52 Reading highway signs is not always easy, especially if your vision is imperfect. Vision in general tends to deteriorate with age. Two researchers conducted a study to determine if and the extent to which age affects the distance at which a standard highway sign can be recognized. Three groups of sixteen volunteer subjects, eight men and eight women per group, were divided on the basis of age. Ages in Group 1 ranged from nineteen to thirty-five, in Group 2 from thirty-seven to fifty-nine, and in Group 3 from sixty-one to seventy-six. All subjects had at least a high school education and were active, licensed drivers in good health. Participants all met minimum vision requirements. Signs were shown to the subjects on a video monitor set up to imitate the way a person would see the signs while driving a car unden daylight conditions. Sign size increased in small increments until the subjects were able to describe the sign satisfactorily. The smallest size at which the sign could be clearly described was called the threshold." Mean threshold values and standard deviations for the three groups are given below. Normal probability plots showed the three populations were well approximated by the Normal distribution. statistic for testing the The numerator degrees of freedom for the ANOVA equality of the three group means is Select one o 45Explanation / Answer
If there are 3 levels of treatment (independent variable) then the degree of freedom in 3-1 = 2. By that logic
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