An engineer wants to measure the bias in a pH meter. She uses the meter to measure the pH in 6 neutral substances and obtains pH readings of 7.11, 7.04, 7.07, 6.99, 7.10, and 7.16 (6 pts)a. Find the mean and standard deviation for the pH values (show your work). (2 pts)b. Create a 95% confidence interval for the pH values read by this meter. Use a t critical value of 2.571. (2 pts)c. Explain in context what your confidence interval tells you about the pH values read by this meter. (1 pt)d. The actual pH of the substances tested was 6.8. Is there evidence the pH meter is testing inaccurately