Cle 035 Introduction To Probability And Statistics Exam Questions & Answers 2023/2024

A utility truck manufacture gives a 4-year/30,000 mile warranty on its drive train. Recently a design team proposed two possible materials 1 and 2 that could extend the drive train's life. The truck underwent 30,000 miles of road testing and the drive train failures were recorded. The estimated difference between the proportion of drive train materials p^1-p^2 = (0.017-0.009)=0.008. The 95% confidence interval for (p1-p2)(0.005,0.011) when the sample size for each group is about 11,000. If the same sample size for each group was instead 1,000 the 95% confidence interval for (p1-p2) would be (-0.002,0.018). This reflects that the confidence interval gets wider when sample sizes get larger. {Ans: } True -->FalseThe amount of horsepower produced by six different engines is provided 158, 168, 161, 163, 154, 162 The median of the data is 161. {Ans: } -->False TrueThe boxplot above summarizes the viscosity of primer paint for aircraft. It shows that 50% of the viscosities were between 33.4 and 34.6. {Ans: } -->True FalseHistorically, 90% of all radio communications messages are successfully transmitted. Researchers would like to determine weather a new system successfully transmits more than 90% of all messages. The researchers perform test and find that 94 out