Janice wants to know if name-brand chocolate cookies contain more chocolate chips than the store-brand chocolate cookies. She selects a random sample of 30 name-brand cookies and counts the number of chocolate chips. She finds the mean number of chocolate chips is 18.54 with a standard deviation of 2.71. She does the same with 48 randomly selected store-brand chocolate chip cookies and finds they have a mean of 19.28 chips and a standard deviation of 2.89. Calculate the test statistic to see if the data provides convincing evidence at the a = 0.05 significance level that the average number of chocolate chips in name-brand cookies is larger tha store-brand cookies. O -1.14 O-2.62 O -1.91 O -1.95