Your Questions About Recycling

The Expert answers:

_The quantity of post-consumer plastics recycled has increased every year since at least 1990. In 2006 the amount of plastic bottles recycled reached a record high of 2,220,000,000 pounds.
_The amount of PET bottles recycled in 2006 increased more than 102 million pounds compared to 2005.
HDPE bottle recycling increased in 2005 to 928 million pounds.
_All plastic bottles were recycled at a rate of 24 percent in 2005.

*Hope This Helps*

The Expert answers:

For every piece of litter dropped, seven little baby kittens are slaughtered mercilessly.

DONT LITTER!!!!!!!!

The Expert answers:

A) I put this statement with statements such as:

“Some people who breathe develop lung cancer”

well, cell phone use could be linked to brain cancer but at this point so many people use cell phones that it would not be possible to isolate the use of cell phones as primary factor in brain cancer

b) the problem with this statement is that it gives information and pushes the answerer in one direction. By saying no to this question you are saying that you disagree with the possible benefits but does not address any of disadvantaged of a national health insurance program. The question should only be “do you support or not support a national system of health insurance” and then allow for the answerer to explain.

C) similar to part b. The first part of the statement pushes the answerer to say yes. Otherwise they are saying that they don’t care about the environment… The actual question, support of economic incentives for recycling is a secondary issue.

For the tv question…
Http://answers.yahoo.com/question/index;_ylt=AqPvlc5nQ4Yaux5IfHWHqgLsy6IX;_ylv=3?qid=20071220203920AA5E8KU

The Expert answers:

A) Not really because then it’s more of a convenience sample. You only get an idea of those who take the time and effort to mail it in. You don’t know anything about the people who didn’t. It’s not random enough.

B) Probably only those who have strong feelings about the recycling program will both to send it back in. Those who don’t really care or haven’t really thought about it probably won’t respond.

The Expert answers:

Assume that the households trash generation is normally distributed.

Standardize all values so that you can compare them to a standard normal curve by subtracting the mean and dividing by the standard deviation.

E.g. If X is the variable representing trash generation, it is distributed Normal with a mean of 28 and a standard deviation of 2. X ~ N(28,2).

To standardize it we write (X – 28) / 2 = Z is distributed Normal with mean 0 and standard deviation 1.

We need to find the probability that X lies between (27,31) or the probability that Z lies between ( (27-28)/2, (31-28)/2) = (-1/2 , 3/2).

Notice that you have to standardize the interval by subtracting the mean and dividing by the standard deviation.

To get the probability that Z is in the interval (-1/2, 3/2) you need to look up the Normal CDF chart in your book, or Z table. The probability is the area under the Z curve (or normal (0,1) curve) between -1/2 and 3/2.

You can compute the values using an online applet like the one found here: http://www.uvm.edu/~dhowell/StatPages/More_Stuff/normalcdf.html

There is .3085 area to the left of -1/2 and an area of .9332 to the left of 3/2. That means there is an area of (.9332 – .3085) = .6247 between the values. Thus the probability that a random household is in the interval is .6247.

The Expert answers:

Since P(HH) = 0.36, P(H) = 0.6, P(T) = 0.4, P(TT) = 0.4^2 = 0.16

The Expert answers:

Q1 (a) ANSWER: PROBABILITY At least half (5 or more) = 3% which is the same as saying 97% of 4 or less.

Why???

BINOMIAL DISTRIBUTION, POPULATION PROPORTION
n = NUMBER OF TRIALS [ 10]
(sample size)
k = NUMBER OF SUCCESSES [4]
(from 0 up to and including k NUMBER OF SUCCESSES)
p = POPULATION PROPORTION [20%]

COMPUTATION OF BINOMIAL PROPORTION:
P(k ? 4) = n!/[k!*(n – k)!] * p^k * (1 – p)^(n – k)= 0.97

The Expert answers:

Well, you can obviously recycle! You can also start riding a bike or something everywhere instead of a car or truck. You can have the 4-9 yr olds to tell there parents to do that (no car). I think that the 9-4 yr olds will enjoy a contest to help save the animals like becomeing a vegitarian for a couple of days or so and whoever does it the longest wins! Hope the ideas work and i hope you help save our planet.

The Expert answers:

Paper recycling is the process of recovering waste paper and remaking it into new paper products. There are three categories of paper that can be used as feedstocks for making recycled paper: mill broke, pre-consumer waste, and post-consumer waste.[1] Mill broke is paper trimmings and other paper scrap from the manufacture of paper, and is recycled internally in a paper mill. Pre-consumer waste is material that was discarded before it was ready for consumer use. Post-consumer waste is material discarded after consumer use, including OMG (old magazines), OTD (old telephone directories), and RMP (residential mixed paper). Paper suitable for recycling is called “scrap paper”.

While there are differences depending on the specific type of paper being recycled (corrugated fiberboard, newspaper, mixed office waste), recycling processes include the following steps:

Pulping: Adding water and applying mechanical action to separate fibers from each other.
Screening: Using screens, with either slots or holes, to remove contaminants that are larger than pulp fibers.
Centrifugal cleaning: Spinning the pulp slurry in a cleaner causes materials that are more dense than pulp fibers to move outward and be rejected.
Flotation: Passing air bubbles through the pulp slurry, with a surfactant present, causes ink particles to collect with the foam on the surface. By removing contaminated foam, pulp is made brighter. This step is sometimes called deinking.
Kneading or dispersion: Mechanical action is applied to fragment contaminant particles.
Washing: Small particles are removed by passing water through the pulp.
Bleaching: If white paper is desired, bleaching uses peroxides or hydrosulfites to remove color from the pulp.
Papermaking: The clean (and/or bleached) fiber is made into a “new” paper product in the same way that virgin paper is made.
Dissolved air flotation: Process water is cleaned for reuse.
Waste disposal: The unusable material left over, mainly ink, plastics, filler and short fibers, is called sludge. The sludge is buried in a landfill, burned to create energy at the paper mill or used as a fertilizer by local farmers.
In the mid-19th century, there was an increased demand for books and writing material. Up to this time, paper manufacturers had used discarded linen rags for paper, but supply could not keep up with the increased demand. Books were bought at auctions for the purpose of recycling fiber content into new paper, at least in the United Kingdom, by the beginning of the 19th century.[28]

Internationally, about half of all recovered paper comes from converting losses (“pre-consumer” recycling), such as shavings and unsold periodicals; approximately one third comes from household or “post-consumer” waste.[29]

Some statistics on paper consumption:

The average per capita paper use in the USA in 2001 was 700 pounds (318 kg). The average per capita paper use worldwide was 110 pounds (50 kg).[30]
It is estimated that 95% of business information is still stored on paper. [Source: International Institute for Environment and Development (IIED) Discussion Paper (IIED, London, September 1996)]
Although paper is traditionally identified with reading and writing, communications has now been replaced by packaging as the single largest category of paper use at 41% of all paper used. [Source: North American Factbook PPI, 1995. (Figures are for 1993)]
115 billion sheets of paper are used annually for personal computers [Source: Worldwatch Institute]. The average daily web user prints 28 pages daily [Source: Gartner group and HP]
Most corrugated fiberboard boxes have over 25% recycled fibers. Some are 100% recycled fiber