6. The manager of an accounting office is studying the problem of incorrect account numbers being entered into the computer system and wishes to produce a p chart. A subgroup of 200 account numbers is selected from each day’s entries and checked to determine the number of incorrect entries. The average proportion of such incorrect entries for the last several months is 0.12.

7. The National Centre for Health Statistics reports that the mean systolic blood pressure for males 35-44 years of age is 128 and a standard deviation of 15. A group of 50 executives selected at random are tested and found to have an average of 132.3. Is there statistical evidence that the executives have a different blood pressure than the population? Use a significance level of 0.05. Solve using a confidence interval approach or a hypothesis test.

6. The manager of an accounting office is studying the problem of incorrect account numbersbeing entered into the computer system and wishes to produce a p chart. A subgroup of 200account numbers…