Using weekly sales data for the last year, Maurice Smith estimates the demand for his 'screen guard' computer reading glasses as the following 100 5P + 2Ps 41 + (15) (0.6) (1.8) (1.2) R2 = .81, SER = 1.75. %3| %3D Where Q is monthly sales quantity of screen guard computer glasses P is the goods price Ps is the price of a normal reading glasses I is income (in thousands of dollars At an approximate 95% level of confidence, which of independent variables in the above expression differ significantly from 0? a. P only p. Ps and I c. P and I d. P, Ps and I

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