SupposeX1,...,X20are iidNor(μx,σ2),Y1,...,Y20are iid Nor(μy,σ2),and all of theX′isare independent of all of theY′is. Further suppose thatX¯¯¯¯=23,S2x=5184,Y¯¯¯¯=−11,and S2y=900.Find a 95% two-sided confidence interval on the ratio of the population variancesσ2x/σ2y

a. the residual plot for model 1 has a random pattern and is a good fit for the data.

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step-by-step explanation:

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step-by-step explanation:

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5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116