Two technicians are discussing the strength of nut-and-bolt…

Two technicians are discussing the strength of nut-and-bolt combinations. Technician A says that a nut-and-bolt combination with a slightly softer nut strength can be tightened to a higher proof load. Technician B says that a nut-and-bolt combination with identical yield strength is less likely to strip. Who is correct?

A medical doctor wants to investigate the relationship betwe…

A medical doctor wants to investigate the relationship between Body Mass Index (BMI) and Blood Pressure (BP). He randomly selects the records of 10 of his patients and his findings are below: Patient 1 2 3 4 5 6 7 8 9 10 BMI 23 28.7 27.8 38.1 28 34.6 45.8 49.7 30.5 29.5 BP 50 56 64 66 70 78 84 90 64 58 The linear regression results are below: (y-hat)        Is it appropriate for him to use the linear regression equation to predict the blood pressure of a patient whose body mass index is 24?