Gary Hansen is a securities analyst for a mutual fund specializing in small-capitalization growth stocks. The fund regularly invests in initial public offerings (IPOs). If the fund subscribes to an offer, it is allocated shares at the offer price. Hansen notes that IPOs frequently are underpriced, and the price rises when open market trading begins. The initial return for an IPO is calculated as the change in price on the first day of trading divided by the offer price. Hansen is developing a regression model to predict the initial return for IPOs. Based on past research, he selects the following independent variables to predict IPO initial returns:
Underwriter rank = 1-10, where 10 is highest rank
Pre-offer price adjustment a = (Offer price - Initial filing price)/Initial filing price
Offer size ($ millions) = Shares sold × Offer price
Fraction retained a = Fraction of total company shares retained by insiders a Expressed as a decimal.
Hansen collects a sample of 1,725 recent IPOs for his regression model. Regression results appear in Exhibit 1, and ANOVA results appear in Exhibit 2
Hansen wants to use the regression results to predict the initial return for an upcoming IPO. The upcoming IPO has the following characteristics:
€¢ Underwriter rank = 6;
€¢ Pre-offer price adjustment = 0.04;

€¢ Offer size = $40 million;
€¢ Fraction retained = 0.70.
Because he notes that the pre-offer price adjustment appears to have an important effect on initial return, Hansen wants to construct a 95 percent confidence interval for the coefficient on this variable. He also believes that for each 1 percent increase in pre-offer price adjustment, the initial return will increase by less than 0.5 percent, holding other variables constant.
Hansen wishes to test this hypothesis at the 0.05 level of significance.
Before applying his model, Hansen asks a colleague, Phil Chang, to review its specification and results. After examining the model, Chang concludes that the model suffers from two problems: 1) conditional heteroskedasticity, and 2) omitted variable bias. Chang makes the following statements:
Statement 1 "Conditional heteroskedasticity will result in consistent coefficient estimates, but both the t-statistics and F-statistic will be biased, resulting in false inferences."
Statement 2 "If an omitted variable is correlated with variables already included in the model, coefficient estimates will be biased and inconsistent and standard errors will also be inconsistent."
Selected values for the t-distribution and F-distribution appear in Exhibits 3 and 4, respectively.
The most appropriate null hypothesis and the most appropriate conclusion regarding Hansen's belief about the magnitude of the initial return relative to that of the pre-offer price adjustment (reflected by the coefficient b j) are:

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EXHIBIT 1 pressed in Decimal Form, i.c., 1% = 0.01) Hansen's Regression Results Dependent Variable: IPO Initial Return (Ex- -Statistic Variable Intercept Underwriter rank Pre-offer price adjustment Offer size Fraction retained Coefficient (b,) Standard Error 0.0019 0.0049 25.11 0.0477 3.06 0.0150 0.4350 -0.0009 0.0202 21.53 -0.82 0.0011 0.0500 0.0260 1.92 EXHIBIT 2 Selected ANOVA Results for Hansen's Regression Sum of Squares (SS) 51.433 Degrees of Freedom (df) Regression 1,720 1,724 Multiple R-squared = 0.36 Residual 91.436 Total 142.869