1.)An advertisement for a new toothpaste states that 58% of users reported better dental checkups. The results of the poll are accurate within 4.2 percent points, 19 times out of 20.

a.) state the confidence level

b.) determine the confidence interval

c.) if all 37 students in a mathematics class used this toothpaste, determine the range of the mean number of classmates who could expect better dental checkups.

What is confidence level and confidence interval, what are the differences between them. how would i solve this?