environment has hampered foot traffic in her area, thus causing a dramatic decline in sales. In order to offset the decline in sales, she has pursued a strong advertising campaign. She believes advertising expenditures have a positive inffuence on sales. To support her claim, Akiko estimates the following linear regression model: 5oles 0+1 Unemploynent +2 Advertising +. A portion of the regression results is shown in the accompanying table. a-1. Choose the appropriate hypotheses to test whether the predictor variables jointly influence sales. H0:1=2=0;HA: At least one j=0 Mo: 1=2=1HA t at least one j0 a-2. Find the value of the appropriate test statistic Note: Round your answer to 3 decimal places. a-3. At the 5% significance level, do the predictor variables jointly influence sales? Yes since all t-tests are significant. Yes since the F-test is significant. Both answers are correct. b-1. Choose the hypotheses to test whether the unemployment rate is negatively related with sales. b-2. Find the p-value. p-value