Error Variation

A company wants to study the relationship between an employee’s length of employment and their number of workdays absent. The company collected the following information on a random sample of seven employees.
Number of workdays absent 2, 3, 3, 5, 7, 7, 8
Length of employment 5, 6, 9, 4, 2, 2, 0
 

a) what is the independent variable (x)?
(b)what is the least squares equation for the data?
(c) what is the correlation coefficient?
(d) what is the estimated number of absences for an employee who has been employed for three years?
(e) what is the coefficient of determination?

Multiple choice
In a two-way ANOVA, the sources of variation are???
a) total variation and error variation
B) total variation, treatment variation, and error variation.
C) total variation, treatment variation, blocking variation and error variation.
D) Treatment variation and blocking variation

Question

A group of investors follows the performance of 1000 companies. Ratings are assigned into one of 5 groups: A=top 20%, B=next 20%, etc. The chart (see next page) shows the one year ratings for a sample of 60 of the largest companies. PART (1): Do the largest companies differ in performance from the performance of the 1000 companies in the Investor’s ratings? Use alpha = .05

CHART: A=5, B=8, C=15, D=20, E=12

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