In a study to determine the impact of gender on the sales of a laptop, a multiple regression model was used with the following results. Significance level was considered to be 0.01.

In a study to determine the impact of gender on the sales of a laptop, a multiple regression model was used with the following results. Significance level was considered to be 0.01.

Adjusted R-Square: 0.838

p-value of Dummy Variable for Gender: 0.047

What percentage of the variability is correctly predicted by the model, and does gender play a significant role in impacting the response variable?