MAT 2379 Lecture Notes - Lecture 1: Histogram, Quantile, Scatter Plot
15 Dec 2015
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To check if the data comes from a normal distribution, we should rst look at the histogram and see if it has a bell-shaped form, and if resembles the plot of the normal density function. We will use descriptive graphical tools to verify the underlying assumption of normality. If the histogram is highly skewed, then we have evidence against the assumption of normality. It represents the attention time (in hours) of 50 sets of 2 year old twin boys. The sample is size is n = 50 observations. The data is found in the le mentalattention. txt. We start by importing the data into r and displaying the names of the variables in the dataframe. We then assign the attention time to the variable x. The distribution of the attention time is highly skewed to the right. We have evi- dence against the assumption that the distribution of a song is normally distribution.
