Interpret the estimated slope of each line

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Reference no: EM131402648

Wind turbine blade stress. Mechanical engineers at the University of Newcastle (Australia) investigated the use of timber in high-efficiency small wind turbine blades (Wind Engineering, January 2004). The strengths of two types of timber-radiata pine and hoop pine-were compared. Twenty specimens (called ‘‘coupons'') of each timber blade were fatigue tested by measuring the stress (in MPa) on the blade after various numbers of blade cycles. A simple linear regression analysis of the data-one conducted for each type of timber-yielded the following results (where y = stress and x = natural logarithm of number of cycles):

Radiata Pine: y^ = 97.37 - 2.50x

Hoop Pine: y^ = 122.03 - 2.36x

(a) Interpret the estimated slope of each line

(b) Interpret the estimated y-intercept of each line

Reference no: EM131402648

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