Friday

July 25, 2014

July 25, 2014

Total # Posts: 23

**Statistics for Behavioral Sciences**

A disease affects 9% of individuals in a population and a sample of 100 people is selected from the population. What is the probability of finding the disease in 15 people?

**Pre-algebra**

P=5g-23=

**Pre-algebra**

P=5g-23=

**algebra**

Find the slope of any line perpendicular to the line through points (0,5) and(-3,-4). I found the slope to be 3, but would the answer to the question be -1/3 ? what are your thoughts?? The slope of your given line is (y2-y1)/(x2-x1) = (-4 -5)/(-3-0) = -9/-3 = 3 The slope of an...

**algebra**

Driving down a mountain, Tom finds that he has descended 1800 ft in elevation by the time he is 3.25 mi horizontally away from the top of the mountain. Find the slope of his descent to the nearest hundredth. I put the numbers into the equation like: 1800/3.25*5280 1800/17160 =...

**Biology**

In plants, why is a small molecular weight defence compound better than a protein? Why is light activation an advantage in plant defense?

**Chemistry**

Explain why aldol reactions involving aromatic aldehydes and ketones are favoured.

**math - statistics**

Suppose that the number of insects captured in a trap on different nights is normally distributed with mean 2950 and standard deviation 550. b) Suppose that we change the location of a trap whenever it captures a number of insects that fall in the lowest 5%. If a trap was relo...

**Mathematics**

Suppose that the number of insects captured in a trap on different nights is normally distributed with mean 2950 and standard deviation 550. a) What is the probability of capturing between 2500 and 3500 insects? b) Suppose that we change the location of a trap whenever it capt...

**Chemistry**

Often, acetal formation is carried out directly with the help of a carbonyl and a diol under acidic conditions. a) Show two acid-base reactions that could occur in the presence of a strong acid such as p-toluenesulfonic acid. b)Draw the two resonance structures that are possib...

**Organic Chemistry**

The preparation of “azo” dyes often does not work well in the laboratory. Although the correct colour is usually apparent, very little product is obtained. Seeing this, a student decides to modify the experimental procedure and obtains a record quantity of product. B...

**Chemistry Q #2**

The preparation of “azo” dyes often does not work well in the laboratory. Although the correct colour is usually apparent, very little product is obtained. Seeing this, a student decides to modify the experimental procedure and obtains a record quantity of product. B...

**Chemistry**

1. Isolation of aniline by steam distillation. (a) Why is NaOH added before performing thedistillation? (b) Suggest a reason for the milky appearance of the distillate and for the change in appearance upon addition of HCl. After having isolated the reduction product, aniline, ...

**MATH - probability #2**

A rescue squad spokesperson claims that the squad receives an average of 3 calls per hour. If at most 6 calls were received over a 5-hour period, would you suspect that the spokesperson was overestimating the average number of calls received per hour? Explain based on the prob...

**math - probability**

Albino rats used to study the hormonal regulation of metabolic pathway are injected with a drug that inhibits body synthesis of protein. Usually, 4 out of 20 rats die from the drug before the experiment is over. a) If 10 animals are treated with the drug, what is the expected ...

**Chemistry**

The nitration of nitrobenzene at room temperature gives 1,3-dinitrobenzene, but not 1,3,5-trinitrobenzene, despite the use of excess reagents. Why is the reaction selective? I think that under ordinary circumstances, at room temperature, some trinitrobenzene is formed, but n...

**Math (Q#2)**

Even though tetanus is rare in the United States, it is fatal 70% of the time. If three persons contract tetanus during one year, what is the probability that none of the three will die. Assume that fatalities due to tetanus are independent of each other. If they are independe...

**Math**

Police report that 88% of drivers stopped on suspicion of drunk driving are given a breath test, 15% a blood test, and 10% both tests. What is the probability that the next driver stopped on suspicion of drunk driving is given: i) at least one of the tests? ii) a blood test or...

**Chemistry**

In polymer chemistry, it is often said that obtaining a polymer with certain desired physical properties is often more a problem of engineering than of chemistry. Why is this the case? bgfhftghgfgfnhgf

**Chem**

Explain why dimethyl maleate is thermodynamically less stable than dimethyl fumarate.

**Chemistry**

In polymer chemistry, it is often said that obtaining a polymer with certain desired physical properties is often more a problem of engineering than of chemistry. Why is this the case?

**Math**

We would like to test 3 different treatments on a particular type of plant. A worker at the local greenhouse will allow us to use 3 amoung 10 plants. *Note: Each treatment will be used on one and only one plant.* a) In how many different ways can we assign the plants to the tr...

**Math - probability**

A lab is developing a new medication for headaches. To do so,they must choose from 10 active ingredients, 5 preservatives and 2 presentations (capsules or tablets). A tablet or a capsule must have at least one active ingredient and one preservative. a)How many different medica...

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