What does "The Oldest and Youngest Places on Earth" suggest about the connection between the earth's mantle and both Baffin Island and Hunga Tonga-Hunga Ha'apai? Question 6 options:

The mantle is what caused thriving ecosystems to emerge on both islands.

The rock that formed and remains on both islands came from or through the mantle.

The stability of the mantle is what has prevented these islands from changing much over time.

The rock that formed both islands has now been absorbed back into the earth's mantle.

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.