Formulate the appropriate null and alternative hypothesis for the following situations

Formulate the appropriate null and alternative hypothesis for the following situations:
a)Junk Email, Inc. Advertises that 63.4{0e601fc7fe3603dc36f9ca2f49ef4cd268b5950ef1bbcf1f795cc00e94cdd119} of its materials are read by the recipients. An environmental group, concerned about waste generation, wants to test this claim.
b) Healthy Chemicals Inc. Boasts that 4 out of 5 doctors prefer their medications. You doubt this claim and decide to test it.
2-Suppose we have to run a test and reject the null hypothesis at 1{0e601fc7fe3603dc36f9ca2f49ef4cd268b5950ef1bbcf1f795cc00e94cdd119} significance level. Without making calculations can we say that we’ll reject it at 5{0e601fc7fe3603dc36f9ca2f49ef4cd268b5950ef1bbcf1f795cc00e94cdd119} significance levels? Support your answers with a graph.
3-fill in the information indicating the correct decisions, type I and II errors, corresponding probabilities alpha and beta and the power of the test
A researcher accepts (fails to reject ho)
Ho is true
Ho is wrong
A researcher rejects Ho
Ho is true
Ho is wrong
4- According to Wall Street Journal an employee in a large corporation receives an average of 41.7 emails per day. Needless to say, most of such emails are unimportant and ever distractive. In an effort to reduce email flow, one company established a prority list that all employees are to follow. One month after this list was put into place, a random sample of 45 employees showed that they were receiving an average of 36.2 emails per day. From IT experts, it is known that the standard deviation is 18.5. Has the new policy had any effect? Use 5{0e601fc7fe3603dc36f9ca2f49ef4cd268b5950ef1bbcf1f795cc00e94cdd119} significance level.
5-Manager of Medicine Hat Community Center claims that the most members are younger than 30 years olf. Having attended to a couple of the Center’s activities, you doubt that this claim is correct. You approach 25 people on random and ask their ages. You have found that the mean age of those people was 37 with the standard deviation of 22 years. Does the data support the managers claim that most members are young? Use 5{0e601fc7fe3603dc36f9ca2f49ef4cd268b5950ef1bbcf1f795cc00e94cdd119} significance level

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