You are conducting a study of voter's opinions on President Biden. The scale of opinion can range from 0 (least liked) to 100 (most liked). In your study, you design an experiment to assess how an advertisement affects people's opinions. In the first sample, the respondents have a mean opinion of 50 with a standard deviation of 10. How many standard deviations away from the original mean is the mean after watching the ad. Was the effect of the ad statistically significant?