In R, please provide the code for the following: Install the EnvStats package and load the library. Use help(varTest) to open the information about the function varTest and read the documentation and notes about using this function Using the precip data set, create a sample of size 20. Use this sample to test if the standard deviation is greater than 15 square miles. Clearly state your hypotheses, rejection rule, and conclusion in your report. Use alpha = 0.05. Compute the population variance of the precip data set (note that the var() function gives the sample variance so you will have to scale it to obtain the population variance). Given this information, what do you think about your test results? Explain any discrepancies or issues that you see.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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In R, please provide the code for the following:

  1. Install the EnvStats package and load the library.

  2. Use help(varTest) to open the information about the function varTest and read the

    documentation and notes about using this function

  3. Using the precip data set, create a sample of size 20.

  4. Use this sample to test if the standard deviation is greater than 15 square miles. Clearly

    state your hypotheses, rejection rule, and conclusion in your report. Use alpha = 0.05.

  5. Compute the population variance of the precip data set (note that the var() function

    gives the sample variance so you will have to scale it to obtain the population variance). Given this information, what do you think about your test results? Explain any discrepancies or issues that you see.

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