Question 12 1. The average local cell phone call length was reported to be 2.27 minutes. A random sample of 20 phone calls showed an average of 2.98 minutes in length with a standard deviation of 0.98 minute. At cr = 0.05 can it be concluded that the average differs from the population average? Step 1: State hypotheses by filling in the symbol (=, , or not equal) and the population mean: Ho: p (Blank 1)_ (Blank 2) H11 U (Blank 3) (Blank 4) Step 2: Find the critical value (from the table) (example: 2.345 or -2.345 or +i'- 2.345)