https://training-course-material.com/index.php?action=history&feed=atom&title=R_-_QuizR - Quiz - Revision history2026-05-14T01:23:14ZRevision history for this page on the wikiMediaWiki 1.45.1https://training-course-material.com/index.php?title=R_-_Quiz&diff=69920&oldid=prevRethabileM: /* Quiz */2018-11-19T05:48:16Z<p><span class="autocomment">Quiz</span></p>
<p><b>New page</b></p><div>[[Category:Intro to R|999]]<br />
== Quiz ==<br />
'''Question 1'''<br />
<br />
The expression <br />
2**4<br />
returns:<br />
* 16<br />
<br />
<br />
<br />
'''Question 2'''<br />
<br />
We want to select two columns from a data frame called ''Clients'', which expression is correct:<br />
* Clients[,c(1,2)]<br />
<br />
<br />
<br />
'''Question 3'''<br />
<br />
What is the value of the expression<br />
2+NA<br />
<br />
* NA<br />
apply<br />
<br />
<br />
<br />
'''Question 4'''<br />
<br />
If you want to calculate mean for each level in a factor, you would use which function:<br />
<br />
* tapply<br />
<br />
<br />
<br />
'''Question 5'''<br />
<br />
We toss a fair coin 16 times, how to calculate probability of getting 7 or less tails<br />
* pbinom(7,prob=0.5,size=16)<br />
<br />
'''Question 6'''<br />
We want to compare two means, which is the best function to use:<br />
* meantest<br />
<br />
'''Question 7'''<br />
In order to add rows to a data frame which function is the most appropriate:<br />
* addrows<br />
<br />
<br />
'''Question 8'''<br />
If you want to plot a bar chart, which function would you use:<br />
* barplot</div>RethabileM