You must indicate whether the test is an Independent or Paired samples t-test (you can deduce this information based on what the grouping variable is...) 1. A doctor wants to examine whether a person's Vitamin D production before Covid-19 lockdown changed after the Covid-19/lockdown. DATA: 45 participants; 18 males/ 27 females; Average age = 42 years old. Average Vitamin D production before Covid (23 ng/ml); Average Vitamin D production after Covid (11 ng/ml). T-test statistic is -18.43 and is significant. WRITE UP