Determine what will happen to the resulting confidence interval for the given scenario, if the proposed changes are made (assume each change is made independently to the original scenario):
In order to estimate a population mean, a sample mean of 34.2 is collected from a sample of size n = 60, and the margin of error is computed to be 2.9 at the 5% level of significance.

The resulting confidence interval for the population mean is 31.3 < μ < 37.1.
a. The level of significance is increased to 10%
The width of the confidence interval increases.
The width of the confidence interval decreases.
b. A 99% confidence level is used
The width of the confidence interval increases.
The width of the confidence interval decreases.