Lab 2D
Directions: Follow along with the slides and answer the questions in red font in your journal.
R
, simulate a playlist of songs containing 30 "rap"
songs, 23 "country"
songs and 47 "rock"
songs.
c
ombined playlist the name songs
.0.30
.replace
option in the sample
function to FALSE
.size
100 from our playlist of songs without replacement. Assign this sample the name without
.
tally(without)
and describe the output. Does something similar happen if you sample with replacement?
~
was not needed with the tally
function. This is because without
was not a variable within a data frame but rather a vector which acts like a lone variable.size = 101
and replace = FALSE
?sample
from the candy jar. Assume the simulated jar is named candies
.do
function to perform 10 simulated sample
s of size
2, without replacement and assign the simulations the name draws
and then View
your file. Use set.seed(1)
.What are the variable names? What happened in the first simulation? Did any of your 10 simulations contain two rap songs?
"rap"
songs.Answer the following questions by performing 500 simulations of sampling 2 songs from a playlist of 30 rap, 23 country and 47 rock songs:
Calculate estimated probabilities for the following situations:
"rap"
songs."rap"
song in the first draw and a "country"
song in the 2nd.Create a histogram that displays the number of times a "rap"
song occurred in each simulation. That is, how often were zero rap songs drawn? A single rap song? Two rap songs?
If we draw 5 songs from a playlist of 30 rap, 23 country and 47 rock songs, how does the estimated probability of all 5 songs being rap songs change if we draw the songs with or without replacement?