Invertase is an enzyme that may aid in spore germination of the fungus Colletotrichum graminicola. A botanist incubated specimens of the fungal tissue in petri dishes and then assayed the tissue for invertase activity. The specific activity values for nine petri dishes incubated at 90% relative humidity for 24 hours are summarized as follows15:
Mean = 5,111 units SD = 818units
(a) Assume that the data are a random sample from a normal population. Construct a 95% confidence interval for the mean invertase activity under these experimental conditions.
(b) Interpret the confidence interval you found in part (a). That is, explain what the numbers in the interval mean.
(c) If you had the raw data, how could you check the condition that the data are from a normal population?