Question

I am having an issue with my Statistics teacher and I am hoping a friend here could clarify. I have enclosed the question I was marked wrong on. Notice the question asks for the LOWER CHI-SQUARE SCORE. Is that appropriate? There is only one CHI-SQUARE SCORE for this problem. But is it appropriate to refer to it as 'lower'? Please review and answer this:

The following is a random sample of the volt measurements of a solar panel taken at various times during the day: 18.9 17.5 17.2 18.4 15.7 18.7 18.1 18.1 17.9 18 18.3 18.1 16.7 18.8 17.8 18.4 18.4 19 18.3 Use this data to test the claim that the standard deviation of all volt measurements is less than 0.5 volts. Use a 99% confidence level. At this level, we can assume that the data are normally distributed. What is the lower chi-square critical value for this test? Round to two decimal places. Incorrect answer: 6.26 Correct Answer: 7.01

Answer 1