THIS IS 1 QUESTION THAT IS A MULTI-PART STATISTICS QUESTION SO THE ANSWER TO ONE PART DIRECT RELATES TO THE NEXT PART AFTER IT - WILL RATE WHOEVER ANSWERS PART A,B,C, AND D.

THESE ARE HYPOTHESIS TESTING PROBLEMS SO FAIRLY EASY FOR THOSE WHO ARE GOOD AT MATH:

Polyester resins reinforced with berglass are used to fabricate wall panels of restaurants. It is theorized that adding cement kiln dust (CKD) to the polyester composite will increase wall panel hardness. In a study, hardness (joules [J] per squared centimeters) was determined for three polyester composite mixtures that used a 40% CKD weight ratio. The hardness values were reported as 83, 84, and 78 J / cm2. Research has shown that the mean hardness value of polyester composite mixtures that use a 20% CKD weight ratio is p: 76 J / cm2. In your opinion, does using a 40% CKD weight ratio increase the mean hardness value of polyester composite mixtures? Support your answers statistically. State the null and alternative hypotheses. Choose the correct answer below. OA. H0:p76 OB. HD:|,L=76 Ha: p=76 H5: \"#76 0c. H0:u=76 OD. HD:p=76 Ha: p> 76 Ha: p