Normally our bodies remain in water balance by taking on and excreting water. An experiment was performed to determine the effects of drinking an isosmotic salt solution versus a hyperosmotic glucose solution on the water balance in our body. Randomly selected participants were randomly assigned one of the two solutions and urine osmolarity (mmol/L) of each participant was measured using a refractometer 30 minutes after drinking.

Using the Q2 data below and R: a) Determine whether there is a difference in urine osmolarity (mmol/L). Use the most powerful test and assume that its assumptions are met.

b) Plot the data in the most appropriate way

Q2 data

Salt	Glucose
1008	1116
792	1200
648	893
828	765
542	648
648	568
936	1003
144	1132
671	1008
180	459
828	972
983	845
1004	987
789	1256
873	1108
932	902