11
In R, how do you compute the mean of a numeric variable named variable?
A)
mean(variable)
B)
calculate_mean(variable)
C)
average(variable)
D)
compute(variable, "mean")
Answer & Solution
Answer: Option
A
12
What function is used to calculate the cumulative distribution function (CDF) of a distribution in R?
A)
cdf()
B)
cumulative_distribution()
C)
pbinom()
D)
cumsum()
Answer & Solution
Answer: Option
C
13
How do you generate a normal probability plot in R for a numeric variable values?
A)
qnorm(values)
B)
plot_normal_prob(values)
C)
qqnorm(values)
D)
create_normal_prob_plot(values)
Answer & Solution
Answer: Option
C
14
What is the purpose of the boxplot() function in R?
A)
Creates a box-and-whisker plot for a numeric variable
B)
Plots a box-shaped figure with user-defined dimensions
C)
Estimates the probability density function of a variable
D)
Generates a random sample from a box-shaped distribution
Answer & Solution
Answer: Option
A
15
In R, how do you compute the median of a numeric variable named variable?
A)
median(variable)
B)
calculate_median(variable)
C)
median_value(variable)
D)
compute(variable, "median")
Answer & Solution
Answer: Option
A
16
What does the qqline() function in R do when used with a quantile-quantile plot?
A)
Adds a line to the quantile-quantile plot
B)
Plots the quantile-quantile line
C)
Generates a random sample from a normal distribution
D)
Evaluates the quantiles of a distribution
Answer & Solution
Answer: Option
A
17
How do you generate a random sample from a binomial distribution in R with parameters n and p?
A)
rbinom(n, p)
B)
binomial_sample(n, p)
C)
sample_binomial(n, p)
D)
generate_binomial(n, p)
Answer & Solution
Answer: Option
A
18
What function is used to calculate the standard deviation of a numeric variable named variable in R?
A)
stdev(variable)
B)
calculate_sd(variable)
C)
sd_value(variable)
D)
compute(variable, "sd")
Answer & Solution
Answer: Option
A
19
How do you create a quantile-quantile plot for a numeric variable values against a theoretical distribution in R?
A)
qqplot(values, dist)
B)
geom_qqplot(mapping = aes(sample = values), dist)
C)
qqnorm(values, dist)
D)
create_qqplot(values, dist)
Answer & Solution
Answer: Option
C
20
In R, what is the purpose of the hist() function with the argument probability = TRUE?
A)
Computes the probability density function of a numeric variable
B)
Plots a histogram with probabilities as heights
C)
Generates a random sample from a probability distribution
D)
Creates a probability plot for a numeric variable
Answer & Solution
Answer: Option
B
