
Problem 1. (16 points) Consider the follow set of n = 5(x, y) pairs: x 2025...
Consider the follow set of ?=5 (?,?)(x,y) pairs: ?x 20 25 26 30 35 ?y 21 30 35 31 40 NOTE: SXX = 126.8, SXY = 139.6, SYY = 197.2, ?¯x¯ = 27.2, and ?¯y¯ = 31.4. Compute the sample correlation correct to three decimal places of accuracy. Correlation = ?=
Consider the follow set of ?=5 (?,?) pairs: ? 20 25 26 30 35 ? 21 30 35 31 37 NOTE: SXX = 126.8, SXY = 116.2, SYY = 152.8, ?¯ = 27.2, and ?¯ = 30.8. Compute the sample correlation correct to three decimal places of accuracy. Correlation = ?=
Problem 3. (16 points) Find the Z-score for a normal measurement that satisfies each of the following statements. (a) The point z with 11 percent of the observations falling below it. Z= (b) The closest point z with 44 percent of the observations falling above it. Note: You can earn partial credit on this problem. preview answers Problem 4. (17 points) A random sample of n = 80 in-coming college freshmen showed that 32 were planning to bring a car...
Consider the following small data set. x-11 y- 22 , x-15 y-16 , x-12 y-27 , x-6 y-26 ,x-5 y- 21 Find the linear correlation coefficient. r=
a. A set of n = 15 pairs of X and Y scores has SSx = 10, SSy = 40, and SP = 30. What is the slope for the regression equation for predicting Y from X? b. For the regression equation Y = 2X – 3, if the mean for X is x̅ = 5, what is the mean for Y? Show work
(1 point) Consider the following small data set. Subject x y 1 10 28 2 14 19 3 7 30 4 14 30 5 16 26 Find the linear correlation coefficient.
For the accompanying data set, (a) draw a scatter diagram of the data, (b) by hand, compute the correlation coefficient, and (c) determine whether there is a linear relation between x and y. Data Set x 2 4 6 6 7 y 4 8 10 14 19 Critical Values for Correlation Coefficient n 3 0.997 4 0.950 5 0.878 6 0.811 7 0.754 8 0.707 9 0.666 10 0.632 11 0.602 12 0.576 13 0.553 14 0.532 15 0.514 16...
A random variable X is said to follow a lognormal
distribution if Y = log(X) follows a normal
distribution. The lognormal is sometimes used as a model for
heavy-tailed skewed distributions.
please answer the follow:
110 15 60 5419 15 73 190 57 4344 18 37 43 55 19 23 82 175 50 80 65 63 36 6 10 17 52 43 70 22 95 20 4 17 15 12 29 29 6 22 40 17 26 30 16 116...
Consider the following small data set Subject x y 1 14 30 2 15 21 3 15 25 4 3 19 5 6 31 Find the linear correlation coefficient. r =
Consider the following set of ordered pairs. x 2 7 1 4 30 y 6 9 5 8 6 Assuming that the regression equation is y = 4.491 +0.679x and that the SSE = 1.0189, construct a 95% confidence interval for the slope. Click here to see the t-distribution table, page 1 Click here to see the t-distribution table, page 2 Construct a 95% confidence interval for the slope. LCL = and UCL = (Round to three decimal places as...