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Introduction

The following are a set of self-test questions designed to complement the expertConcepts tutorial. These exercises are only meant to be attempted after you have finished the expertConcepts tutorial.

Problem Set

Load in the precip dataset.

  1. What is the mean, median, and standard deviation of precip?

  2. Is precip best visualized using a barplot( ) or hist( )? Why?

  3. Generate a vector of random numbers drawn from a normal distribution with the same mean, standard deviation, and number of elements as in the precip dataset. Name this vector RandomNormal.

  4. Write a function that tests, based on the means of each distribution, whether it is likely that RandomNormal and precip were drawn from the same underlying distribution.

  5. Create a density( ) plot of precip and RandomNormal. Is the test you performed above (question 4) a good or bad indicator of whether the two distributions are identical? Why or why not?