Statistics decision making

 
In Mar 2018, Cold Storage started getting complaints from their Clients that they have been getting complaints from end consumers of the dairy products going sour and often smelling. On getting these complaints, the supervisor pulls out data of last 35 days temperatures. As a safety measure, the Supervisor has been vigilant to maintain the temperature below 3.9 deg C. 
Assume 3.9 deg C as upper acceptable temperature range and at alpha = 0.1 do you feel that there is need for some corrective action in the Cold Storage Plant or is it that the problem is from procurement side from where Cold Storage is getting the Dairy Products. The data of the last 35 days is in “Cold_Storage_Mar2018.csv”

State the Hypothesis, do the calculation using z test (10 marks)
State the Hypothesis, do the calculation using t test (10 marks)
Give your inference after doing both the tests (10 marks)

NOTE: Please ping me for the Mean and the Standard Deviation before solving the problem

Please use the following datasets (as attached) : Cold_Storage_Mar2018.csv