Voltage and insulating fluid

Reference no: EM131011998

Voltage and Insulating Fluid. Researchers examined the time in minutes before an insulating fluid lost its insulating property. The following data are the breakdown times for eight samples of the fluid, which had been randomly allocated to receive one of two voltages of electricity:

Times (min) at 26 kV: 5.79 1579.52 2323.70

Times (min) at 28 kV: 68.8 108.29 110.29 426.07 1067.60

(a) Form two new variables by taking the logarithms of the breakdown times: Y1 D log breakdown time at 26 kV and Y2 D log breakdown time at 28 kV.

(b) By hand, compute the difference in averages of the log-transformed data: Y 1 - Y 2.

(c) Take the antilogarithm of the estimate in (b): exp.Y 1 - Y 2/. What does this estimate? (See the interpretation for the randomized experiment model in Section 3.5.2.)

(d) By hand, compute a 95% confidence interval for the difference in mean log breakdown times. Take the antilogarithms of the endpoints and express the result in a sentence.

Reference no: EM131011998

Questions Cloud

Ingestion rates of deposit feeders : Aquatic deposit feeders are organisms that feed on organic material in the bottoms of lakes and oceans. Display 9.21 shows the typical dry weight in mg, the typical ingestion rate (weight of food intake per day for one animal) in mg/day, and the p..

What is the average rate of change in the noise level : Freeway noise lessens as the distance from the freeway increases. What is the average rate of change in the noise level as you go from 70 to 90 yards away from the freeway?

Find parametric equations for the lone : Find parametric equations for the lone in which the two planes intersect. Find an equation of the plane that is perpendicular to the two planes and containing the point (5, 1, -2).

Solar radiation and skin cancer : The data in Display 3.11 are yearly skin cancer rates (cases per 100,000 people) in Connecticut, with a code identifying those years that came two years after higher than average sunspot activity and those years that came two years after lower tha..

Voltage and insulating fluid : Researchers examined the time in minutes before an insulating fluid lost its insulating property. The following data are the breakdown times for eight samples of the fluid, which had been randomly allocated to receive one of two voltages of electr..

Means-medians-logs-ratios : Means, Medians, Logs, Ratios. Consider the following tuitions and their natural logs for five colleges:

Potential violation of one of the independence assumptions : In each of the following data problems there is some potential violation of one of the independence assumptions. State whether there is a cluster effect or serial correlation, and whether the questionable assumption is the independence within g..

Find the number of roots and their approximate locations : Plot this polynomial in the interval [-100, 100]. Find the number of roots, and their approximate locations in this interval (Include this plot).

Respiratory breathing capacity of individuals : Respiratory breathing capacity of individuals in houses with low levels of nitrogen dioxide was compared to the capacity of individuals in houses with high levels of nitrogen dioxide.

User Account

All Pages