The buyer of electric bulbs bought 100 bulbs each of two famous brands. Upon testing these, he found that brand A had a mean life of 1500 hours with a standard deviation of 50 hours, whereas brand B had a mean life of 1530 hours with a standard deviation of 60 hours. Can it be concluded with R code at a 5% level of significance that the two brands differ significantly in quality? Use RStudio to solve this.