Find a 95% confidence interval for this data.a)What units are used for data?b)What is the interval ? c)According to the interval ,which group did better on exam ?d)Enter one of the following for words: visual, textual , both , Neither?????????

Researchers wanted to know whether there was a difference in comprehension among students learning a computer program based on the style of the text. They randomly divided 36 students of similar educational level, age, and so on, into two groups of 18 each. Group 1 individuals learned the software using a visual manual, while group 2 individuals learned the software using a textual manual. Students were then given an exam on the material and their scores were recorded. The scores (given as a number of points) for 9 participants in each group are shown below. We will assume that the test scores are normally distributed for this particular exam. Visual Textual Manual: Manual: Exam Scores Exam Scores