A study is conducted to evaluate intelligence quotient (IQ) scores for patients with various types of schizophrenia. Twenty patients were dropped from the sample because they could not complete two or more portions of the test. Four additional patients refused to take the test. Results for the 100 patients who completed the test showed an average IQ of 110 with a standard deviation of 20. Which of the following is the best estimate of the 95% confidence interval for this sample?
A. 70 to 130
B. 70 to 150
C. 85 to 115
D. 90 to 130
E. 105 to 115
F. 106 to 114
A. 70 to 130
B. 70 to 150
C. 85 to 115
D. 90 to 130
E. 105 to 115
F. 106 to 114