Question

# A swimming school claimed that the average seven-year-old would be able to swim across an Olympic-sized...

A swimming school claimed that the average seven-year-old would be able to swim across an Olympic-sized pool in less than 120 seconds after taking lessons from their instructors. To test this claim, a consumer psychologist arranged for eight randomly selected seven-year-old children to take lessons at the school and recorded how long it took each child to swim across a pool at the end of the lessons [sample mean (M) = 95, and estimated population variance (S2) = 600]. Using the .05 significance level, do seven-year-old children who take lessons at the swimming school take less time to swim across an Olympic-sized pool than seven-year-old children in general? One-tail test

Step III: Determine the cut-off value on the comparison distribution at which the null hypothesis should be rejected

t test hypothesis calculation.

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