Answer:
C) Sample: the 120 students surveyed. Population: the 1200 students at the high school. Parameter of interest: the average number of hours a student at this high school sleeps per night.
Step-by-step explanation:
- Population is the total units of study for the research.
- Sample is the selected units, chosen for conducting the research study.
- Parameter of interest is the characteristic or variable, that is studied related to the population or sample
Research of average hours of sleep in a school; on the basis of 120 students selected for the study; are :-
- Population is the total number of students in the school, i.e = 1200 students
- Sample is the selected number of students, chosen (enquired) for the study, i.e = 120 students
- The parameter of interest is the variable of students, that needs to be studied, i.e average sleep hours.
Answer:
452.2
Step-by-step explanation:
r x r x h x 3.14 (pi) = 6x6x3.14x4=452.16, rounded to tenth is 452.2
Answer: A≈226.98 ft²
Step-by-step explanation:
The formula for area of a circle is A=πr². The formula doesn't include diameter , but we can certainly find the radius from the diameter.
d=2r
17=2r
r=17/2=8.5 ft
Now that we have the radius, we can plug it in to area formula.
A=πr²
A=π(8.5ft)²
A=π72.25ft²
A≈226.98 ft²
