Answered: The proportion of students who passed…

Functions and Change: A Modeling Approach to College Algebra (MindTap Course List)

6th Edition

ISBN:9781337111348

Author:Bruce Crauder, Benny Evans, Alan Noell

Publisher:Bruce Crauder, Benny Evans, Alan Noell

Chapter3: Straight Lines And Linear Functions

Section3.3: Modeling Data With Linear Functions

Problem 15SBE

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Directions: Solve the following problems. 1. The proportion of students who passed an engineering examination was 80%. Students complained that they would have done better if they were allowed to use calculators. Later, a random sample of 90 students took this exam with calculators and 75 passed. Was this a significant improvement at 0.05 level? 2. It is claimed that the average time spent by employees on telephone calls is less than 6 minutes. In a study time spent on the telephone by its employees, a large office monitors a random sample of 25 employee calls and finds the mean length of this calls to be 5.8 minutes with a standard deviation of 1.4 minutes. Is the claim true at 0.05 level of significance?

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