这题是我在写中央考古题看到的， A local eat-in pizza retaurant want to investigatethe possibility of starting to deliver pizzas. the owner of the store has determined that home delivery willbe sucessful if the averag time spent on the deliveries does not exceed 26 minutes. The owner has randomly selected 17 customers and has deliver pizzas to their homes.Whatare the hypotheses the owner should test to show that pizza delivery will not be sucessful? （1）H0：u＝26 （2）H0：u＝26 （3）H0：u＜26 （4）H0：u＝26 H1：u＞26 H1：u≠26 H1：u＝26 H1：u＜26 我在写的时候，因为它最後一句说的是要检验它是不成功的 所以我选的是1，因为只要可以拒绝掉H0，也就是u会大於26 也就是不成功的，但是我看高点的统计详解，写的是第4个答案 究竟是我写错，还是他写错？ 想说PO上来问一下大家，麻烦了。 --

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