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2. (55%) A random sample of 64 college students shows that average weight is 160 lb. with a Standard deviation of 20 lb. a) At 1% level of significance, does the sample provide enough evidence to prove that the mean weight of all college students is less than 165 lb.? b) Also explain the meaning of alpha and P-value occurred in this problem. c) Describe what kind of error it is for type II error in the content of this