A company is developing a new protective case for cell phone

A company is developing a new protective case for cell phones. The case will protect a phone from damage if it falls from up to about 55 inches above the ground so the company wants to find out if the average height when phones are accidentally dropped is no more than 55 inches. The company surveys 8 customers selected at random who had their phones repaired after drops and found the average heights dropped. Assuming the assumptions and conditions for appropriate hypothesis testing are met with ? = 0.05, the company calculated a test statistic of -2.43. Using a calculator or Excel (T.DIST), what is the P-value?

Solution

here degree of freedom =n-1=8-1=7

and as it is left tailed test from given function p value =t.dist(-2.43,7,1) =0.0227