A covered bridge is 6 2/3 yards long. In a painting for sale at a gallery, the bridge is 1 1/4 feet long. A customer wants to kn
ow the ratio of the length of the bridge in the painting to the actual length of the bridge. One salesperson says the ratio in simplest form is 3/1. Another salesperson says the ratio in simplest form is 1/16.
Increasing the sample size by a factor of 4 or multiplying
it by 4 is equal to increasing the standard error by 1/2. Therefore, the
interval will be half as varied. This also works almost for population
averages as lengthy as the multiplier from the t-curve doesn't modify much when
increasing the sample size.
