A lathe is set to cut steel bars and considered to be in perfect adjustment if the average length of the bars it cuts is 7 cm. A sample of 31 bars is selected randomly and the length are measured. It is determined that the average length of the bars in the sample is 7. 055 cm with a standard deviation of 0. 35 cm. Find a 97% confidence interval that the average length of the bars is in perfect adjustment.

Layer r contains a well-known index fossil that is 100 million years old. based on this information and the principle of superposition, a. layers t and m are older than 100 million years, and layers x and g are younger than 100 million years. b. layers t, m, x, and g are all older than 100 million years. c. layers t and m are younger than 100 million years, and layers x and g are older than 100 million years.