4) In this question, we assume that the sample mean is = 8.1, the sample standard deviation is s = 3 and the sample size is n = 30. The confidence interval constructed from this data has a margin of error of 1.03045 Recall that in a confidence interval, the margin of error is the number m such that the confidence interval is of the form [a-m, a +m]. a) Determine the value t* which was used to calculate this confidence interval: t*: Number (Enter your answer correct to at least 4 decimal places.) b) Hence determine the level of confidence which was used to calculate this confidence interval: Level of confidence = the nearest percent.) (Enter 0.70 for 70% for instance. Your answer must be correct to