View the step-by-step solution to:

The Speedo LZR Racer Suit is a high-end, body-length swimsuit that was launched on February 13, 2008.

2. The Speedo LZR Racer Suit is a high-end, body-length swimsuit that was launched on February 13, 2008. When 17 world records fell at the December 2008 European Short Course Championships in Croatia, many believed a modification in the rules surrounding swimsuits was necessary. The FINA Congress, the international governing board for swimming, banned the LZR Racer and all other body-length swimsuits from competition, effective January 2010. In a statement to the public, FINA defended its position with the following statement: "FINA wishes to recall the main and core principle that swimming is a sport essentially based on the physical performance of the athlete" (BBC Sport, March 14, 2009).

Luke Johnson, a freelance journalist, wonders if the decision made by FINA has statistical backing. He conducts an experiment with the local university's Division I swim team. He times 10 of the swimmers swimming the 50-meter breaststroke in his/her bathing suit and then retests them while wearing the LZR Racer. The results are saved in "LZR_Racer" of Chapter10.xlsx.


In a report, use the sample information to

a.   Determine whether the LZR Racer improves swimmers' times at the 5% significance level. Assume that the time difference is normally distributed.

b.   Comment on whether the data appear to support FINA's decision.

Swimmer Time in Bathing Suit Time in LZR Racer

1 27.64 27.45

2 27.97 28.06

3 29.04 28.84

4 29.85 29.63

5 30.12 30.18

6 32.73 32.71

7 33.32 32.87

8 35.36 35.21

9 37.34 37.11

10 38.08 37.93

Top Answer

The best way to approach your question... View the full answer


Sign up to view the full answer

Why Join Course Hero?

Course Hero has all the homework and study help you need to succeed! We’ve got course-specific notes, study guides, and practice tests along with expert tutors.


Educational Resources
  • -

    Study Documents

    Find the best study resources around, tagged to your specific courses. Share your own to gain free Course Hero access.

    Browse Documents
  • -

    Question & Answers

    Get one-on-one homework help from our expert tutors—available online 24/7. Ask your own questions or browse existing Q&A threads. Satisfaction guaranteed!

    Ask a Question
Ask a homework question - tutors are online