Question

2 friends, Stace and Tim, want to grow tall flowers, but don't agree on the methods for growing. They each take seeds for the same type of flower but plant them in different large flower boxes with different soil and a different schedule for watering. After 60 days they measure their flowers' heights (in cm). The results are given in the table below.

(Group) Person	Mean	Standard deviation	Sample Size
(1) Tim	27	4.2	18
(2) Stace	31.3	8.1	19

a. Using the table above, which of the following are true about the sample?

Tim's flowers grew taller and had more variation.

Stace's flowers grew taller and had more variation.   

Tim's flowers grew shorter and had more variation.

Stace's flowers grew shorter and had more variation.

b. This data should be treated as  ---

Not Paired

Paired

c. The parameter you are trying to estimate is  ---

x

μ1-μ2

μ

x1-x2 .

d. The 95% CI for the difference in heights is
(  ,  )(Use 2 decimal places and enter the lower number first)

e. If the 2 friend's flower growing methods are equally effective, then the difference between heights will be  ---

positive

zero

negative

Answer 1