A t test statistic in the Excel linear regression output associated with an individual independent variable is reported as 0.06, then it indicates the associated independent variable is O a. statistically significant at the 99% confidence level. O b. not statistically significant at the 95% confidence level. O c. statistically significant at the 95% confidence level. O d. not statistically significant at the 5% confidence level. O e. not statistically significant at the 90% confidence level