(iv) Produce a density plot for the t-distribution (similar to the example below), with the degrees of freedom from Welch's approximation as obtained in part (ii). The plot should also show the value of t-statistic as obtained in part (ii) (indicated by a red dashed line), with 5% significance level critical region shaded.
Contingency Table
A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.
Binomial Distribution
Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.
RStudio used here. The provided example code doesnt run. I have degrees of freedom = 90.41 and test stat = -3.52
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