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Chapter 9: Q.3 (page 597)

To determine the reliability of experts who interpret lie detector tests in criminal investigations, a random sample of 280such cases was studied. The results were

(a) 15/280.

(b) 9/280.

(c) 15/140.

(d) 9/140.

(e) 15/146.

Short Answer

Expert verified

The reliability of experts who interpret lie detector tests in criminal investigations is15/140.

The correct option is (c) .

Step by step solution

01

Given Information

H0 : Suspect is innocent.

Ha : Suspect is guilty.

02

Explanation

Type II error: Fail to reject the null hypothesis, when the null hypothesis is false.

Interpretation: The Suspect's true Status is Guilty, while the Examiner's decision is "Innocent".

The probability is the number of favorable outcomes divided by the number of possible outcomes:

P(Type II error)=P(" Innocent" ∣Guilty)

=#of favorable outcomes#of possible outcomes

=1515+125

=15140

Therefore, the correct answer is (C).

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