the efficiency expert claims that a new ergonomic desk chair

the efficiency expert claims that a new ergonomic desk chair makes typing at a computer terminal easier and faster. To test it, 15 volunteers are selected. Using both the new chair and their old chair, each volunteer types a randomly selected passage for 2 minutes and the number of correct words typed is recorded. Find and state the null and alternate hypothesis. (could someone please explain how you came up with the answer? I don\'t quite understand what I should be looking for in this)

Solution

Here same group of people are asked to use new chair and old chair

Then test is conducted to see whether there is any difference in the mistakes due to chairs

As the same people are tested the results would be more accurate

Null hypothesis would be to assume that there is no difference because of chairs.

Alternate hypothesis would be to claim that number of correct words is more in the new chair

Hence hypotheses would be:

i) H0: mu 1 = mu2

   Ha: mu1 < mu2

(where mu is the average correct words typed )

mu1 =chair 1

mu2 = chair 2