What is the probability that at most one is being deceptive

Assignment Help Basic Statistics

Reference no: EM131085377

Part A-

1. A company's customer support division want to test to see if that wait time for a consumer to talk to a representative is under 10 minutes. The manager proposes to test one case where a consumer was placed on hold. Is this a good testing strategy? If not what would be a better testing strategy? Could you form a Null Hypothesis or an Alternative Hypothesis? If yes, what would they be.

2. Using a specific example explain what a point estimation is and a confidence interval is.

Part B-

Question 1: The length of human pregnancies from conception to birth varies according to a distribution that is approximately Normal with a mean of 266 days and standard deviation of 16 days.

What percent of pregnancies last less than 240 days?
What percent of pregnancies last between 240 days and 270 days?
How long do the longest 20% of pregnancies last?

Question 2: A federal report find that a lie detector test given to truthful persons have a probability of 0.2 of suggesting that the person is deceptive. A company asks 12 job applicants to take a lie detect test. Suppose that all 12 applicants answer truthfully.

What is the probability that exactly one is being deceptive?
What is the probability that at most one is being deceptive?
What is the mean and standard deviation of this distribution?

Reference no: EM131085377

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