Based on data from USA Today, the following are the results from tests of an experiment to test the effectiveness of a vaccine for children. Suppose a child from this population will be randomly selected. What is the probability that the child belongs to the placebo group?

Smoking and high blood pressure are risk factors for strokes and other vascular diseases. Suppose in the U.S., [x] % of adults smoke, and [y] % have high blood pressure. Suppose also that research suggests that smoking and high blood pressure are independent of each other, but they are not mutually exclusive. What is the probability that a randomly-chosen American adult has either of these two risk factors? (Fill in the numerical value. Round your answer to two decimal places).

When adults with smartphones are randomly selected, 54% use them in meetings or classes (Based on data from a previous Smartphone survey).  If 10 adult smartphone users are randomly selected. Let X be the variable the number of adults that use smartphones in  meetings or classes in a sample of 10 adults with smartphone (Select all that apply)    

A farmer who sponsors a contest supplies a pumpkin for each of the contest participants. The pumpkins weigh an average of 20 pounds with a standard deviation of 5 pounds and the distribution of pumpkin weights can be assumed to follow approximately a normal distribution. Pumpkins that fall in the top 30% of weights are considered “large”. How much does a pumpkin have to weigh in order to be considered “large”?   .

Points on a firm’s total product curve are

The a firm’s short-run cost curves shifts when there is a change in

Babies born in singleton births in the U.S. have weights that are approximately normally distributed with a mean 3.5 kg and standard deviation of 0.3 kg. Regarding this population: What is the probability of randomly selecting a baby weighing between 3 and 4 kg?

Which structure is necessary for bacterial conjugation  [a]A) a pilusB) a cell wallC) endosporesD) a capsuleE) flagella

What interactions exist:Between cellulose-digesting organisms in the gut of cow? [a]Between two rams butting heads to mate with a female? [b]Between fungal hyphae and plant roots? [c] A) +/+B) +/0C) +/-D) -/-

Nitrifying bacteria participate in the nitrogen cycle mainly by [a] A) converting nitrogen gas to ammoniaB) releasing ammonium from organic compounds, returning it to the soilC) converting ammonium to nitrate, which plants absorbD) incorporating nitrogen into amino acids and organic compounds