Use the sample information x=43,=3,n=13 to calculate the following confidence intervais for assuming the sample is from a normal population. (o) 90 percent confidence. (Round your answers to 4 decimal places.) (b) 95 percent confidence. (Round your answers to 4 decimal places.) (c) 99 percent confidence. (Round your answers to 4 decimal places.) (d) Describe how the intervals change as you increase the confidence level. The interval gets narrower as the confidence level increases. The interval gets wider as the confidence level decreases. The interval gets wider as the confidence level increases. The interval stays the same as the confidence level increases