A researcher wants to know if people of different age groups spend the same time on purchasing goods and services. The researcher considers four age groups and conducts a survey using random sample for each of these groups. Each person answered the question, how many hours, on average, he or she usually spends on purchasing goods and services during a week. The results are represented in the table below. Chose the correct null and alternative hypotheses statements.
A) The null hypothesis is , and the alternative is Hα: at least two of μ's are different.
B) The null hypothesis is , and the alternative is Hα: all μ are equal.
C) The null hypothesis is ,
,
,
, and the alternative is Hα: all μ are equal.
D) The null hypothesis is ,
,
,
, and the alternative is
,
.
Correct Answer:
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