Question

The systolic blood pressure of individuals is thought to be related to both age and weight. Let the systolic blood pressure, age, and weight be represented by the variables x₁, x₂, and x₃, respectively. Suppose that Minitab was used to generate the following descriptive statistics, correlations, and regression analysis for a random sample of 15 individuals.

Descriptive Statistics
Variable	N	Mean	Median	TrMean	StDev	SE Mean
x1	15	154.35	154.65	154.35	3.450	0.890786
x2	15	68.43	69.33	68.43	1.266	0.326880
x3	15	186.00	185.60	186.00	4.952	1.278601

Variable	Minimum	Maximum	Q1	Q3
x1	126	175	143.478	167.513
x2	45	89	47.361	77.400
x3	122	243	141.511	222.372

Correlations (Pearson)
	x1	x2
x2	0.848
x3	0.836	0.671

Regression Analysis

The regression equation is

x₁ = 0.833 + 1.388x₂ + 0.937x₃

Predictor	Coef	StDev	T	P
Constant	0.833	0.693	1.20	0.126
x2	1.388	0.665	2.09	0.029
x3	0.937	0.513	1.83	0.046
S = 0.320	R-sq = 91.7 %	R-sq(adj) = 93.7 %

Relative to its mean, which variable has the greatest spread of data values?

Answer 1