A Test of Writing Ability Is Given to a Random $\overline { \mathrm { d } }$

question 27

Multiple Choice

A test of writing ability is given to a random sample of students before and after they completed a formal writing course.The results are given below.Construct a 99% confidence interval for the mean difference between the before and after scores if $\overline { \mathrm { d } }$ (before - after) = 2.0 and sd =2.6457 $\text { Before } 70\quad80\quad92\quad99\quad93\quad97\quad76\quad63\quad68\quad71\quad74$ After 69 79 90 96 91 95 75 64 62 64 76

• A)(-0.2,4.2)
• B)(-0.1,4.1)
• C)(-13.6,17.6)
• D)(1.2,2.8)
• E)(-0.5,4.5)

---

Definitions:

Bonobo Sexual Activity

Describes the variety of sexual behaviors among bonobos, used for social bonding, conflict resolution, and pleasure.

Primate Species

Members of the mammalian order Primates, which includes humans, apes, monkeys, and others, characterized by large brains, forward-facing eyes, and often opposable thumbs.

Female Primate

A member of the primate order distinguished by its female reproductive features, including females from species like apes, monkeys, and humans.

Estrus

In some primate females, the time of sexual receptivity during which ovulation is visibly displayed.