Exhibit 10

question 20

Multiple Choice

Exhibit 10.10.A bank is trying to determine which model of safe to install.The bank manager believes that each model is equally resistant to safe crackers,but sets up a test to be sure.He hires nine safe experts to break into each of the models,timing each endeavor.The results (in seconds) are given next,paired by expert.Let D be the difference: Time to break Safe 1 minus Time to break Safe 2. Refer to Exhibit 10.10.Assuming the difference D is normally distributed,what is the 95% confidence interval for μ_D?

• A)[-1.7537,5.7537]
• B)[-1.1459,5.1459]
• C)[-0.6739,4.6739]
• D)[-0.5368,4.5368]

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Definitions:

Morula

is an early stage in embryonic development, a solid ball of cells resulting from the division of a fertilized ovum.

Zygote

The cell that is formed from the union of the egg and sperm.

Mesoderm

The middle layer of an embryo in early development, which gives rise to muscles, bones, and other connective tissues.

Ectoderm

The outermost layer of cells or tissue of an embryo in early development, giving rise to the outer layer of skin and nervous system.