4. The following table presents data on x- the number of oil changes per year and y the cost of repairs for a sample of 10 cars from a given region: Number of oil changes per year (x ost of Repai...

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4. The following table presents data on x- the number of oil changes per year and y the cost of repairs for a sample of 10 ca

math Statistics-And-Probability

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Answer 1

Answer #1

d)

correlation is negative

it is strong

SUMMARY OUTPUT

Regression Statistics
Multiple R	0.904534034
R Square	0.818181818
Adjusted R Square	0.795454545
Standard Error	79.0569415
Observations	10

ANOVA
	df	SS	MS	F	Significance F
Regression	1	225000	225000	36	0.000323393
Residual	8	50000	6250
Total	9	275000

	Coefficients	Standard Error	t Stat	P-value	Lower 95%
Intercept	673.5294118	51.99314568	12.95419623	1.19425E-06	553.6330028
x	-88.23529412	14.70588235	-6	0.000323393	-122.1471196

y^= 673.5294 -88.2353 x

c)

when number of oil change increase by 1 , cost of repair decreases by 88.2353

d)

y^= 673.5294 -88.2353 *7

= 55.8824

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Answer 2

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