题目
DATA1001/1901 (ND) Revision Quiz 4
多重下拉选择题
View the following code, and then select the correct options from the dropdown menus: ggplot(iris, aes(x = Sepal.Length)) + geom_histogram(aes(y = after_stat(density)), bins = 9) + stat_function(fun = dnorm, args = list(mean = mean(iris$Sepal.Length), sd = sd(iris$Sepal.Length))) The code utilises the [ Select ] iris ChickWeights CO2 dataset and the [ Select ] Petal.Length Sepal.Width Sepal.Length variable, before plotting a Density histogram with [ Select ] 11 8 9 10 12 bins. The normal curve on top is drawn using the [ Select ] Mean and interquartile range Mean and standard deviation does not colour adds a blue colour to adds a blue fill to Median and standard deviation of the variable selected.
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标准答案
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思路分析
The question asks you to complete several dropdown selections based on the given ggplot2 code operating on the iris dataset. We will evaluate each dropdown in turn, explaining why the chosen option is correct or incorrect.
Option 1 (dataset): iris
- This code uses the iris dataset, as indicated by the call ggplot(iris, aes(x = Sepal.Length)). The iris dataset is a classic built-in data frame in R containing measurements of iris flowers, including Sepal.Length. Therefore selecting iris for the first dropdown is correct.
- Why the alternatives would be incorrect: selecting a different dataset (e.g., ChickWeights, CO2) would not align with the code’s data source, which is explicitly iris her......Login to view full explanation登录即可查看完整答案
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