Arm length is being measured in a group of 1000 adults. The average value or mean is found to be 26 cm, the 95% confidence interval was found to be 23-28 cm. This means that: Question 18Answer a. every adult's arm will measure between 23 and 28 cm. b. 95% of all arm circumference measurements should fall between 23 and 28 cm. c. only arm circumference of 26 cm was counted in this study. d. there is no random error in this data set