THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION

question 44

Multiple Choice

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A career counselor is interested in examining the salaries earned by graduate business school students at the end of the first year after graduation.In particular,the counselor is interested in seeing whether there is a difference between men and women graduates' salaries.From a random sample of 20 men,the mean salary is found to be $42,780 with a standard deviation of $5,426.From a sample of 12 women,the mean salary is found to be $40,136 with a standard deviation of $4,383.Assume that the random sample observations are from normally distributed populations,and that the population variances are assumed to be equal.
-In order to construct a confidence interval estimate for the difference between two population means,independent samples are obtained from two normal populations with unknown but assumed to be equal variances.If the first sample contains 18 items and the second sample contains 14 items,which of the following distributions will be used?

• A)the t distribution with 32 degrees of freedom
• B)the t distribution with 17 degrees of freedom
• C)the t distribution with 13 degrees of freedom
• D)the t distribution with 30 degrees of freedom

---

Definitions:

Lou Gehrig Disease

Also known as Amyotrophic Lateral Sclerosis (ALS), a progressive neurodegenerative disease affecting nerve cells in the brain and spinal cord.

Amyotrophic Lateral Sclerosis

A progressive neurodegenerative disease affecting motor neurons, leading to muscle weakness and atrophy.

Multiple Sclerosis

An autoimmune disorder where the body's immune system attacks the protective sheath (myelin) of nerve fibers, causing communication problems between the brain and the rest of the body.

End Plate

On a muscle, the receptor–ion complex that is activated by the release of the neurotransmitter acetylcholine from the terminal of a motor neuron.