A breathalyser test is used by police in an area to determine whether adriver has an excess of alcohol in their blood. The device is not totally reliable: 6 %of drivers who have not consumed an excess of alcohol give a reading from thebreathalyser as being above the legal limit, while 10 % of drivers who are above thelegal limit will give a reading below that level. Suppose that in fact 11 % of driversare above the legal alcohol limit, and the police stop a driver at random. Giveanswers to the following to four decimal places.Part a)What is the probability that the driver is incorrectly classified as being over the limit?Part b)What is the probability that the driver is correctly classified as being over the limit?Part c)Find the probability that the driver gives a breathalyser test reading that is over thelimit.Part d)Find the probability that the driver is under the legal limit, given the breathalyserreading is also below the limit.

Given 6 % of drivers Haven't consumed alcohol 10%of drivers above the legal limit

Answered: A breathalyser test is used by police…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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!.) Compute the predictive value positive and predictive value negative.
The well-known psychologist Dr. Elbod has established what he calls his Generalized Anxiety Scale (GAS). The GAS, which is a scale from 0 to 10, measures the "general anxiety" of an individual, with higher GAS scores corresponding to more anxiety. (Dr. Elbod's assessment of anxiety is based on a variety of measurements, both physiological and psychological.)We're interested in making predictions about individuals' sleep behavior based on their GAS scores. The bivariate data below give the GAS score (denoted by x) and the number of hours of sleep last night (denoted by y) for each of the fifteen adults in a study. The least-squares regression line for these data has equation Ŷ=8.48-0.28x This line, along with a scatter plot of the sample data, is shown below. (The 2nd picture contains the rest of the data as it would not fit in the first pic and it includes the question as well.)

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