A researcher knew that before cellphones, a person made on average…

Question A researcher knew that before cellphones, a person made on average… A researcher knew that before cellphones, a person made on average 3.5 calls per day. He believes that the number of calls made per day today is higher. He selects a random sample of 35 individuals who use a cell phone. He asks them to keep track of the number of calls that they made on a certain day and the mean was found to be 3.9 calls. Using 5% level of significance, is there enough evidence to support the researcher’s claim? The standard deviation for the population found by a previous study is 0.90. a. State the hypothesis statements; the type and direction of the test. b. Write down the underlying assumptions required to carry out the test. c. Calculate the test statistic. d. Obtain the p-value for the test.  Math Statistics and Probability MATH 1081 Share QuestionEmailCopy link Comments (0)