The box plots below show the lifespan, in months, of laptop batteries manufactured by four companies: box plot labeled company a shows minimum at 19, first quartile at 19.5, median at 23, third quartile at 23.5, and maximum at 24. company b shows minimum at 21, first quartile at 22, median at 24, third quartile at 25, and maximum at 26. company c shows minimum at 20, first quartile at 21, median at 22, third quartile at 24, and maximum at 28. company d shows minimum at 19, first quartile at 20, median at 22.5, third quartile at 23.5, and maximum at 27. based on the data, which company manufactures batteries having the greatest variation in lifespan?

Circle a has a diameter of 7 inches, a circumference of 21.98 inches, and an area of 38.465 square inches. the diameter of circle b is 6 inches, the circumference is 18.84 inches, and the area is 28.26 square inches. part a: using the formula for circumference, solve for the value of pi for each circle. (4 points) part b: use the formula for area and solve for the value of pi for each circle. (4 points)

20 ! jason orders a data set from least to greatest. complete the sentence by selecting the correct word from each drop-down menu. the middle value of the data set is a measure and is called the part a: center b: spread part b: mean a: mean absolute deviation b: median c: range

Stu and ambrose are working together on a study of whether diet is related to students' mental health. first, they randomly select 10 students from the student center and 10 students from the office of counseling and psychological services. then, they ask students to rate their diet in terms of healthiness on a scale of 1-100 before completing a 20-item mental health survey. a) name one of the constructs being studied b) how was the construct you named above operationally defined in this experiment? e) was the variable you described above their independent variable, their dependent variable, or a controlled variable? d) what is a confounding variable? what is a potential confound in this study?