Question

After being rejected for employment, Kim Kelly learns that the Bellevue Credit Company has hired only five women among the last 18 new employees. She also learns that the pool of applicants is very large, with an approximately equal number of qualified men as qualified women.

Help her address the charge of gender discrimination by finding the probability of getting five or fewer women when 18 people are hired, assuming that there is no discrimination based on gender.
(Report answer accurate to 8 decimal places).
P(at most five) = ...................................................................................

Because this is a serious claim, we will use a stricter cutoff value for unusual events. We will use 0.5% as the cutoff value (1 in 200 chance of happening by chance). With this in mind, does the resulting probability really support such a charge?

Yes or No?

• no, this does not support a charge of gender discrimination
• yes, this supports a charge of gender discrimination

Answer 1

n=18

p=0.5

P ( X = 0) = C (18,0) * 0.5^0 * ( 1 - 0.5)^18=      0.0000
P ( X = 1) = C (18,1) * 0.5^1 * ( 1 - 0.5)^17=      0.0001
P ( X = 2) = C (18,2) * 0.5^2 * ( 1 - 0.5)^16=      0.0006
P ( X = 3) = C (18,3) * 0.5^3 * ( 1 - 0.5)^15=      0.0031
P ( X = 4) = C (18,4) * 0.5^4 * ( 1 - 0.5)^14=      0.0117
P ( X = 5) = C (18,5) * 0.5^5 * ( 1 - 0.5)^13=      0.0327

P(at most 5)= 0.04812622

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since, P(at most 5) = 0.048 >0.005

so, answer is

• no, this does not support a charge of gender discrimination

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