The NFL needs to buy a new batch of official coins for the pre-game coin flip ...

     The NFL needs to   buy a new batch of official coins for the pre-game coin flip. They get 3 sample   coins from a manufacturer based in Sweden, and tell their intern to flip all 3   coins simultaneously multiple times and count the number of heads each time.   The intern gets: 0 heads 7 times; 1 head 7 times; 2 heads 8 times; and 3   heads 8 times. Should the NFL buy coins from that manufacturer, i.e., are the   coins fair or not? Perform the best test you can, making sure you clearly   state your hypotheses and that you answer with a P-value. At 95% significance,   what is your conclusion