considering the following null and alternative hypotheses: H0: >= 20, H1 < 20. A random sample of five observations was: 18,15,12,19 and 21. With a significance level of 0.01. Is it possible to conclude that the population mean is less than 20?
a) State the decision rule
b) Calculate the value of the test statistic
c) What is your decision about the null hypothesis?
d) Estimate the p-value.