What are the answers for the problems below? please give me explanations as well. please ignore the random line or number. thank you. this is from cliff ap statistics book

1. 12, Suppose that a study has been done, whereby the age of a species of tree is estimated by measuring the circumference of its trunk. The following least- squares regression line has been created that relates the circumference, x, in inches, with the age of the tree, v, in years, y = -34.97 + 0.848x for 50 70. A sample has been taken, and based on the results, Type I error has been committed. Which of the following best describes a scenario in which this occurred? A. The sample mean was observed o be near 70, but the true mean was greater than 70. B. The sample mean was observed to be significantly greater than 70, but the true mean was 70. C. The sample mean was observed to be significantly less than 70, but the true mean was 70, D. The sample mean was observed to be significantly greater than 70, and the true mean was greater than 70. E. The sample mean was observed to be near 70, and the true mean was 70, Which of the following statements is not true about the r-distribution? A. The r-distribution is symmetric. B. The r-distribution is wider than the normal distribution. C. As the number of degrees of freedom increases, the r-distribution becomes approximately normal. D. The total area under the r-distribution is 1. E. As the degrees of freedom increases, the r-distribution becomes wider