Blog

Several factors influence a public speaker’s delivery, including:

Resting heart rates for a population are normally distributed with a mean of 72 bpm and a standard deviation of 10 bpm. If a sample of 16 people is randomly chosen, find the probability their mean heart rate is more than 75 bpm. Hints: Recall the central limit Theorem: The mean of the sampling distribution = mean of the population, but the standard deviation is adjusted (

Which of these is an example of a specific purpose?

When you switch from one main point to the next within the body of the speech, use ______________ that clearly signpost the direction in which you are going. 

Which of the following is NOT an element of an argument?

A company plans to invest in a particular project. There is a 35% chance that they will lose $30,000, a 25% chance they will make a profit of $55,000, and a 40% chance that they will make a profit of $0 (which is breaking even). What is the company’s expected profit? Hints: Expected profit =

Which term is not correctly matched?

When two similar liquids mix to form a solution, the entropy of solution (ΔSsoln) is expected to be

An educator wants to construct a 95% confidence interval for the proportion of elementary school children in Colorado who are proficient in reading. The results of a recent statewide test suggested that the proportion is 0.70. Using this estimate, what sample size is needed to have a confidence interval to within 5 percentage points? Hints: Prior estimate is given; n =

At a given temperature and pressure, which of the following would be expected to have the greatest molar entropy? A) Br2(s) B) Br2(l) C) Br2(g) D) All of these would be expected to have the same molar entropy.