Question: What is the true proportion of heart disease diagnosis rate? (https://isle.stat.cmu.edu/data-explorers/cleveland/)

Let's test whether the true proportion of heart disease diagnosis rate is statistically different from 0.5 with this data.

1. State the null and alternative hypotheses.

1. Calculate the test statistic by hand. Use the summary statistics from "target" variable.

1. Perform the one-sample proportion test from ISLE.

1. Make a conclusion with 5% level of significance.

1. Construct a 95% confidence interval for the true proportion of heart disease diagnosis rate.