Before a high-school football game the footballs were inflated to p = 13 psi (pounds per square inch). After the game the mean inflation was 12.5 psi. Select the null hypothesis H0.

Group of answer choices

0=13

0=12.5

0<13

0>12.5

What’s the answer ? use the picture to see the problem

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240 seventh graders and two-thirds of the students participate in after-school activities how many students participate in after-school activities