Ten diabetic patients had their plasma glucose levels (mmol/L) before and
after 1 hour of oral administration of 100 g of glucose. The results are
shown in Table 5.2.
(a) Calculate the mean difference in plasma glucose levels.
(b) Calculate the standard error of the mean.
(c) Assuming a normal distribution for the change in plasma glucose.
Based on the results in the table how many diabetic patients would
you need to sample to get a 95% two - sided confi dence interval for
the mean difference to have width 0.5 mmol/L? Treat the estimated
standard error as if it were a known constant for this calculation.
