Validating data

For these exercises, we’ll use the mtcars data set build into base R.

1. What are the dimensions of mtcars?

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2. In one line of code, view the data types for all of the columns in mtcars.

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3. What is the range of values for the mpg column?

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4. What are all of the possible values used in gear?

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5. Check whether the value 5 is found in the carb column.

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6. Do any columns have missing values?

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7. What is the 3rd quartile for mpg?

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8. Check whether all horsepower (hp) values fall between 50 and 300. Which row numbers fall out of this range?

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9. Make a codebook for mtcars.

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