Answer with explain

1. A conservation group conducted a study to determine whether common loons in a certain region were ingesting food containing unhealthy levels of lead ( measured in parts per million). The lead levels of a random sample of 23 loons in the region were measured and recorded. The data are shown in the stemplot below. Lead Levels (a) [4 points] The mean lead level of the 23 loons in the sample was 4.90 ppm and the standard deviation was 1.12 ppm. Construct and interpret a 95 percent confidence interval for the mean lead level of loons 588 in the region. GUI A AWON 688 012234 99 6 34 6 68 Key: 2 8 = 2.8 ppm(b) [2 points] A biologist classified lead levels greater than 5.2 parts per million (ppm) as unhealthy. Does the interval in part (a) support a claim that loons in this region are ingesting an unhealthy amount of lead? Explain your reasoning. (c) [2 points] You constructed a 95% confidence interval for the mean lead levels of loons in the region. Explain what you would expect to happen to the length of the confidence interval if the sample size was doubled