Chapter 8 Confidence Intervals (Mean) Score: 02'14 W14 answered Progress saved Done '3 E1 ' 5 0 Question 8 v 80/1 pt '0 3 Z 99 CD Details A researcher is interested in finding a 90% confidence interval for the mean number of times per day that college students text. The study included 130I students who averaged 39.4 texts per day. The standard deviation was 16.8 texts. a. To compute the confidence interval use a ? 9 distribution. b. With 90% confidence the population mean number of texts per day is between [ J and texts . c. If many groups of 130 randomly selected members are studied, then a different confidence interval would be produced from each group. About [ J percent of these confidence intervals will contain the true population number of texts per day and about ' percent will not contain the true population mean number of texts per day. Hint: Hints C Video C Textbook if Submit