I already answered these questions, I would like an explanation for each if possible. Thanks

Adult male polar bears are expected to weigh, on average, 3TB kg. The US Geological Survey (USGS) conducted a study' in the Southern Beaufort Sea to investigate whether climate change has appeared to negatively impact the weight of polar bears, on average. Eighty-three {33} adult male polar bears were captured between March and May of the years 1990 and 2006 and their weights were recorded. The sample mean weight was 324.6 kg and the sample standard deviation was 33.3 kg. The sample data was not skewed. Question 12 [1 point] For the Polar Bear study, are validity conditions met in order to use theory-based methods? 0 Yes, since there are at least 10 successes and 10 failures. 0 Yes, since the sample size is greater than 20 and the sample distribution is not stronglv skewed. 0 Yes, since the sample distribution is approximately symmetric. 0 We cannot determine whether validity conditions are met with the information given. Question 13 [1 point) For the Polar Bear study, what is the parameter of interest? 0 The number of adult male polar bears that have lost weight in the Southern Beaufort Sea 0 The mean weight of the 83 adult male polar bears in the sample 0 The proportion of adult male polar bears in the Southern Beaufort Sea that weigh less than 3?0 kg 0 The true mean weight of adult male polar bears in the Southern Beaufort Sea Question 14 [2 points) For the Polar Bear Study, use an appropriate formula to calculate the standard deviation of the sample mean for samples of size 33. Round your answer to three places after the decimal. :le Question 15 [3 points) Use your answer to the previous question and the study information to find a 250 95% confidence interval for parameter of interest. Write your interval as {Blank 1, Blank 2) with numbers correct to two places after the decimal. Blank # 2 5