A company in Maryland has developed a device that can be attached to car engines, which it believes will increase the miles per gallon that cars will get. The owners are interested in estimating the difference between mean mpg for cars using the device versus those that are not using the device. The following data represent the mpg for random independent samples of cars from each population. The variances are assumed equal and the populations normally distributed. 
Given this data, what is the upper limit for a 95 percent confidence interval estimate for the difference in mean mpg?
Definitions:
Cognitive Interpretation
The process by which an individual perceives, organizes, and interprets their thoughts and surroundings.
Congenitally Blind Children
Children who are born without the ability to see, resulting from genetic conditions, in utero development issues, or injuries at birth.
Emotional Expressions
Observable manifestations of one's emotional state, including facial expressions, body language, and vocal tones.
Observational Learning
The process of learning behaviors by watching and imitating others.
Q8: As the automobile accident rate increases, insurers
Q29: How would you respond to a statement
Q29: Explain what is meant by partitioning the
Q36: If two variables are related in a
Q47: The Adams Shoe Company believes that the
Q67: What is meant by the terms Type
Q69: The goodness-of-fit test is always a one-tail
Q125: The executive director of the United Way
Q139: The Gordon Beverage Company bottles soft drinks
Q155: Examine the following two-factor analysis of variance