The Moon Illusion refers, roughly speaking, to the common experience that the moon appears larger (and closer to us) when it is near the horizon than when it is at its zenith. To investigate, we have designed an experiment in which participants must adjust the diameter of a variable circular light placed at eye level to match the diameter of a fixed circular light placed well above eye level. (See, for example, Kaufman, L. & Rock, I. (1989), "The moon illusion thirty years later," chapter 8 in M. Hershenson (Ed.) The Moon Illusion, Hillsdale, NJ: L. Earlbaum.) We have tested 25 participants and recorded for each participant her experimental "adjustable/ fixed ratio." Our data are summarized in the following histogram. Frequency 0 10 8+ 6+ 4. 2+ 0 0 3 0.20 6 9 0.40 0.60 Adjustable/ fixed ratio 4 X 0.80 Based on the histogram, find the proportion of adjustable/ fixed ratios in the sample that are greater than or equal to 0.20. Write your answer as a decimal, and do not round your answer. S 3 1

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The Moon Illusion refers, roughly speaking, to the common experience that the moon appears larger (and closer to us) when
it is near the horizon than when it is at its zenith. To investigate, we have designed an experiment in which participants must
adjust the diameter of a variable circular light placed at eye level to match the diameter of a fixed circular light placed well
above eye level. (See, for example, Kaufman, L. & Rock, I. (1989), "The moon illusion thirty years later," chapter 8 in M.
Hershenson (Ed.) The Moon Illusion, Hillsdale, NJ: L. Earlbaum.)
We have tested 25 participants and recorded for each participant her experimental "adjustable/ fixed ratio." Our data are
summarized in the following histogram.
Frequency
10
8-
6-
4+
2+
0
0
3
6
0.20
9
0.40
0.60
Adjustable/ fixed ratio
4
X
0.80
3
1
Based on the histogram, find the proportion of adjustable/ fixed ratios in the sample that are greater than or equal to 0.20.
Write your answer as a decimal, and do not round your answer.
Transcribed Image Text:The Moon Illusion refers, roughly speaking, to the common experience that the moon appears larger (and closer to us) when it is near the horizon than when it is at its zenith. To investigate, we have designed an experiment in which participants must adjust the diameter of a variable circular light placed at eye level to match the diameter of a fixed circular light placed well above eye level. (See, for example, Kaufman, L. & Rock, I. (1989), "The moon illusion thirty years later," chapter 8 in M. Hershenson (Ed.) The Moon Illusion, Hillsdale, NJ: L. Earlbaum.) We have tested 25 participants and recorded for each participant her experimental "adjustable/ fixed ratio." Our data are summarized in the following histogram. Frequency 10 8- 6- 4+ 2+ 0 0 3 6 0.20 9 0.40 0.60 Adjustable/ fixed ratio 4 X 0.80 3 1 Based on the histogram, find the proportion of adjustable/ fixed ratios in the sample that are greater than or equal to 0.20. Write your answer as a decimal, and do not round your answer.
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