Hypothesis testing

Question

Alondra , Lídia Co creators of quiadas inc claim that their facial blend will keep woman’s skin and healthy for at least 65 days. Alex ,advocate tested 15 bottles and found a mean of 63 days with a standard deviation of 2 days. Test at the 10% significance level whether the company claim is true.

Answer 1

  ( 65-63)/ ( 2/sqrt(15)) = 3.87298334621

 

         is greater than

 

 10% significance p -value = 1.25

 

Reject NULL hypothesis

 

There is evidence that the mean is not 65