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Ten customers rated four different smartphone apps. The customer ratings for the four different apps are shown in the following dotplots. Use the dotplots to answer the following questions.

Which app has the smallest variability? In other words, in which app are the observations really close together?

Which app has the largest variability? In other words, in which app are the observations really close together?


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   x    (   ) π DNE
( ) ( ] [ ) [ ] —∞ DNE
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log logn ln n  | | e 
sin cos tan arcsin arccos arctan  
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