(b) Repeat (a) for test RSS.

For test RSS, the null hypothesis states that the population mean weight is not pre-determined and therefore the sample test statistic follows a normal distribution. The test statistic is calculated as: t = (X-bar - µ)/(s/√n) where X-bar is the sample mean, µ is the population mean, s is the sample standard deviation and n is the number of observations in the sample. For test RSS, the critical value at the 5% level of significance is 1.64498. This means that if the test statistic t is greater than or equal to 1.64498, then we can reject the null hypothesis with a 95% confidence. If the calculated test statistic value t is 1.64498 or less than 1.64498, then we fail to reject the null hypothesis with a 95% confidence.