An Olympic Swim coach would like to know if a new type of swim wear will help hi

Question

An Olympic Swim coach would like to know if a new type of swim wear will help his swimmers swim faster. He randomly selects 8 swimmers and has each of them swim the 100 meter freestyle---once in the new type of swim wear and once in their usual swim wear. He wants to estimate the true mean difference in each swimmer's times. A confidence interval for which of the following would be most appropriate for this study?

One mean, known One mean, unknown Paired data Two means, using independent samples One proportion Two proportions

Explanation / Answer

Unknown paired data two means would be correct to study as in this case coach need to distinguish best results between the new suit and odinary suit that means a paired test.

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