For each of the following situations related to determining the average weight of a National Football League player, indicate how the appropriate sample size would change by using the letters I (increase), D (decrease), or N (no change). Assume that all other factors are held constant.
____ 1. The desired level of precision changes from 20 pounds to 10 pounds.
____ 2. The sampling risk increases from 5 percent to 10 percent.
____ 3. The number of football players in the population increases from 1,400 to 1,600.
____ 4. You initially want to estimate the weight for offensive linemen only but decide to in include quarterbacks, running banks, and placekickers.
____ 5. Your initial sample estimate changes from 250 pounds to 230 pounds.
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