A car manufacturer claims that one of its new hybrid model…
A car manufacturer claims that one of its new hybrid models has an average fuel efficiency of 50 miles per gallon (mpg). An independent consumer organization collects a sample of n = 40 vehicles and finds that the average fuel efficiency is 48 mpg (SD = 6.2 mpg). If a one-sample t test is conducted, what does rejecting the null hypothesis suggest?