R commands y1

Question 1

What is the command to read in a data file?

Answer 1

yourname<-read.csv(“filename.txt”,h=T)

Question 2

How to take a random sample of a dataset that you specify?

Answer 2

sample(c(“”,””,””),x)
where x is the amount of sample you are pulling out

Question 3

How would you use function x work with dataset Y?

Answer 3

x(y)

Question 4

What is the function of adding all of the values in a dataset?

Answer 4

sum

Question 5

What is the function of finding the mean of a datset?

Answer 5

mean

Question 6

What is the function of finding the maximum value in a dataset?

Answer 6

median

Question 7

What is the function of finding the variance in a dataset?

Answer 7

var

Question 8

What is the function of finding the standard deviation of a dataset?

Answer 8

sd

Question 9

What is the function for a shapiro wilk test for normality of a dataset?

Answer 9

shapiro.test(dataset)

Question 10

What happens if the p from a shapiro wilk test is >0.05?

Answer 10

The data is not significantly different from a normal distribution thus it is normal

Question 11

What happens if the p from a shapiro wilk test is <0.05?

Answer 11

The data is significantly different from a normal distribution thus it is not normal

Question 12

How do you make a bar chart?

Answer 12

create a table of the data
barplot(table(dataset))

Question 13

How to make a histogram?

Answer 13

hist

Question 14

How do you plot two variables on a scatterplot?

Answer 14

plot(varA,varB)

Question 15

How to create a boxplot?

Answer 15

boxplot(data1$x~data1$y)
data1 = name of file you are calling data from
$ = allows you to extract elements by name from a list or data file

Question 16

Binomial test where you input the data, and the assumption?

Answer 16

binom.test(#successes,#trials)
assumes probabilities are equal

Question 17

Binomial test where you input the data and probabilities?

Answer 17

binom.test(120,600,1/6)