Answer all 5 questions clearly

QUESTION 12 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 a = 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: H H1: H Step 2: Find the critical value (from the table) (example: 2.345 or -2.345 or +/- 2.345) Critical t value is: Step 3: Compute the test value using the formula (round to two decimal places, example 6.45): T test value is: Step 4: Reject the null or do not reject the null (type in either Reject the null or do not reject the null only): Step 5: Conclusion sentence (type in either is or is not only, to reflect what you found): There enough evidence to support the claim that the mean local cell phone call length differs from 2.27 minutes. Click Save and Submit to save and submit. Click Save All Answers to save all answers