Question Help State the conclusion based on the results of the test The mean oft

Question

Question Help State the conclusion based on the results of the test The mean ofthe pressuro required toopen a cartan vulvo is known to be -69 pal Due to changes n o.o mrutotueng process nul hypothesis was nejected the qualit-orwer manager fees t the average pressuro has been reduced The Choose the correct answer below OA. Thero is sumient evidence that the mean ofthe pressure regured to open a ontain vavehas been miced O 8· Tho mean of he pressure has not changed. OC. There is not lent evidence that the mean ofthe pressure required to open o certain volve has not changed O D. There is suficient evidence that the mean of the pressure required to open a certain valve has not O E. There is not suicient evidence that the mean of the pressure required to open a certain valve has been reduced O F The mean of the pressure has been reduced

Explanation / Answer

The Mean of the pressure to open the valve is u = 6.9

And In the manufacturing process the manager feels the average pressure has been reduced .

So, H0 : u   = 6.9   vs H1 : u < 6.9

Here Null hypothesis is rejected ,

That is we accept H1 ,

So, correct option is A .

There is sufficient evidence that mean of the pressure required to open a ceratin valve has been reduced .

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