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Which measure of central tendency can be used for both numerical and categorical variables?

What is the writing on the boats?

This subject is relatively rare in the artist’s body of work.

This is definitely the last painting by the artist.

What did the artist hope to convey in this painting? [open ended answer]

What nutrients do calories come from? 

Which of the two options (given above) for question 36 do you prefer to answer?

How much protein is needed a day for children ages 1-3 years old? 

Is all fat bad and unhealthy? 

What is the start to finish process of nutrition?