Do larger parties tend to leave a larger tip Figure D 3 shows a scatterplot between the size of the tip and the number of guests Figure D 3 (a) Does there appear to be an association in the data between number of guests and tip size If so, is it positive or negative Are there any outliers (b) The c...

a There appears to be a positive association in the data with larger parties tending to give larger ...

Do larger parties tend to leave a larger tip? Figure D.3 shows a scatterplot between the size

Question:

Do larger parties tend to leave a larger tip? Figure D.3 shows a scatterplot between the size of the tip and the number of guests.

Figure D.3

16 14 12 10 : 8- 6 4 2- 6 2 3 4 5 Guests

(a) Does there appear to be an association in the data between number of guests and tip size? If so, is it positive or negative? Are there any outliers?
(b) The correlation between the two variables is r = 0.504 with n = 157. Test to see if this shows a significant positive correlation.
(c) If the correlation is significant, does that imply that more guests cause the tip to go up? If not, what is an obvious confounding variable?

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