Serum thyroxine levels (nmol/L) were recorded for hypothyroid infants. One group had no symptoms while in the second group symptoms were present.

Enter the data into jamovi, label the columns and set the appropriate measure type.

1. Is this an experimental or quasi-experimental design?
2. Carry out a Welch test to determine whether there was a statistical difference between the two groups of patients. Summarise fully the results of this analysis.
3. Include a Descriptives plot from the analysis, showing 95% confidence interval error bars.
4. Comment on the plot.