Mathematics, 02.09.2021 23:50, txayrion
(a) In Cindy Lou Who's multivariable calculus class, the teacher gave a multiple choice quiz with 20 questions. After the quiz, the teacher listed the number of correct answers for each student (x) and the number of incorrect answers (y). The mean number of correct answers in the class was 14.3, with a standard deviation of 2.5, and the mean number of incorrect answers was 6.7, also with a standard deviation of 2.5. The correlation between x and y was. . .
-1, -0.5, -0.25, 0, 0.25, 0.5, 1, "can't tell without the actual data"
Choose one and explain your answer briefly.
(b) In a longitudinal study on growth, 1034 children were followed for 15 years. Among other data that the investigators collected were the heights of the children each year. Which of the following two correlations is bigger? Justify your answer briefly.
• r1 The correlation between a child's heights at age 4 and at age 18.
• r2 = The correlation between a child's heights at age 16 and at age 18.
Answers: 2
Mathematics, 21.06.2019 16:50, gesic2003
Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?
Answers: 3
Mathematics, 21.06.2019 23:30, pradojosselinep34b1k
Find the directions in which the function increases and decreases most rapidly at upper p 0p0. then find the derivatives of the function in these directions. f(x, y)equals=x squared plus xy plus y squaredx2+xy+y2, upper p 0p0left parenthesis 1 comma negative 4 right parenthesis
Answers: 2
(a) In Cindy Lou Who's multivariable calculus class, the teacher gave a multiple choice quiz with 20...
Arts, 25.04.2021 01:00
Biology, 25.04.2021 01:00
English, 25.04.2021 01:00
Mathematics, 25.04.2021 01:00
SAT, 25.04.2021 01:00
English, 25.04.2021 01:00