A survey is conducted in Texas city to know the customer satisfaction levels of two companies. 54 customers of Samsung company and 86 customers of Nokia 66 company were randomly selected and were asked to rate their opinion. The survey results are summarized in the following table.
ExxonMobil
754
H₁ 28.6
01 = 4.17
Phillips 66
7286
H42 20.44
02-5.72
Find the sampling distribution of the difference between two sample means.
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