An automobile manufacturer claims that its van has a 27.6 miles/gallon (mpg) rating. an independent testing firm has been contracted to test the mpg for this van since it is believed that the van has an incorrect manufacturer's mpg rating. after testing 210 vans, they found a mean mpg of 28.0. assume the standard deviation is known to be 2.3. a level of significance of 0.05 will be used. find the value of the test statistic. round your answer to 2 decimal places.

2.52

Step-by-step explanation:

An automobile manufacturer claims that its van has a 27.6 miles/gallon (MPG)

So,

n = 210 vans

x = 28

Formula of test statistic =

Hence the value of the test statistic is 2.52

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

this was already solved by me with a different person. if you look it up in the search bar at the top of the page, you will get the answer.

step-by-step explanation: