Blog

How many unique cutpoints are used to compute the Kaplan-Meier and Nelson-Aalen estimators? (Don’t include time 0).

Suppose we ignored right-censoring in our sample by treating individuals as having died at the censoring time. Is there bias in our estimate of the survival curve? If so, in what direction?

In the scenarios below, the log-rank test would have the lowest statistical power for [q1]. A weighted log-rank test would have the greatest increase in power over the unweighted log-rank test for [q2], and an unweighted log-rank test would have the highest power relative to a weighted test in [q3].

True or false: Our tiebreaking procedures assume that tied failure times are due to rounding from non-constant monitoring rather than being true ties.

“Les, a minor, enters into a contract to buy a dirt bike from Motocross LLC. Les can ordinarily disaffirm the contract”

The transfer of information from DNA to RNA occurs during _______, while the transfer of information from RNA to protein occurs during _______.

On the image of DNA below, which letter represents a 3′ end? 

Why is RNA incorporated into the DNA molecule during DNA replication?

Griffith’s transformation experiments demonstrated that combining heat-killed bacterium strain S (smooth capsule and lethal) with bacterium strain R (rough capsule and non-lethal) transformed strain R into the lethal strain S. Which of the following treatments before combining the two strains would provide evidence that DNA is the genetic material?

Assume that daily high temperatures in Orlando are normally distributed with a mean of μ = 82 degrees and a standard deviation σ = 6. Find the probability that a randomly selected day has a high temperature that is more than 95 degrees. p = _____ MUST use Statcrunch