I am confused, please help :)

4. The supplier of a particular brand of vitamin pills claims that the average potency of these pills after a certain exposure to heat and humidity is greater than 63. Before buying these pills, a distributor wants to verify the supplier's claim is valid under 0.05 significance level. To this end, the distributor chooses a random sample of 9 pills from a batch and measures their potency after the specified exposure. The data are 63. 72. 64. 69. 59. 65. 66, 64, and 65. Note that the sample variance is 13.44. For this problem, we can assume the population distribution is approximately normal. (a) Check the three assumptions. (b) State the null and alternative hypotheses. (c) Calculate the test statistic. (d) Find the pvalue by using the pvalue calculator and provide the conclusion and interpretation. (e) Based on your conclusion in part (d), what type of error could you have possibly made? Explain in the context of the