Question

Researchers used two footballs of the same size to examine the effect of helium on kicking distance. One football was filled with air, and the other was filled with helium. Eleven people participated in the study. Each person kicked the football filled with air and the football filled with helium, and the kicking distances, in yards, were recorded. The football that was kicked first was determined by the flip of a fair coin, and the people did not know which football was filled with air and which was filled with helium. What type of study was conducted by the researchers and, of the following, which is the appropriate t-interval for inference?.

Answer 1

For the study conducted by the researchers,

• The type of study that was conducted is a matched-pairs design
• The appropriate t-interval for inference is a t-interval for a mean difference

How to determine the type of study?

From the question, we have the following highlights:

• One football was filled with air (the control group)
• The other was filled with helium (the experimental group)

When a study used a control group and an experimental group, then such study is a matched-pairs design.

How to determine the appropriate t-interval for inference?

The appropriate t-interval for inference for a matched-pairs design is the  t-interval for a mean difference

Read more about matched-pairs design at:

https://brainly.com/question/16448112