It is believed that educational attainment is higher in countries with higher expenditure on education as a percentage of GDP. Assuming that there is a linear relationship between expenditure on education as a percentage of GDP and percentage of labour force (over 25 years old) with at least post-secondary education for 14 countries in the World Socioeconomic Data, answer the following questions using the dataset labour force2015.xlsx.

(f) Perform a hypothesis test at the 5% significance level for the gradient of the regression line and draw conclusions about whether there is evidence for a relationship between Expenditure on education as percentage of GDP and Percentage of labour force with at least post-secondary education.