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sp2606 [1]
3 years ago
9

the video states that 56% of high school students report using sunscreen in 2011, while 68% reported using sunscreen in 2001, le

ading the researchers to conclude that sunscreen use is declining among this population. describe a scenario in which this conclusion could be wrong.( hint: these percentages aer estimates based on sample of this population. while you should assume that they calculated the estimates correctly, consider what other characteristics of these sample could lead to this conclusion being wrong.)
Mathematics
1 answer:
iVinArrow [24]3 years ago
3 0

Answer:

For any conclusion to be made on the population based on a sample survey, the sample must be representative of the population. Sample represents the population if the following condition is fulfilled:-

The sample is a Simple Random Sample (SRS). A SRS is chosen in such a way that all possible samples of size n are equally likely. This implies that the sample is not biased.

Getting the representative sample is the challenge. The flaws / conditions ignored by the researchers in this case can be:-

Are only male students surveyed? In that case, the female population is ignored.

Are the students surveyed are from a particular region only? Say students surveyed are from "Alaska" where it is cold in most part of the year and people tend to use less sunscreen.

Are students surveyed are from a particular age group only? Say student surveyed are only from Grade 6. Then the sample does not represent students from other grades.

There are chances that the survey was done at the convenience of the surveyor who approached only those students who were approachable - those playing outside the school. This is called convenience sampling. Though the individuals contacted are easy to contact, they may not be representative of the population.

Step-by-step explanation:

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How do you solve this problem? With work!!
Evgesh-ka [11]
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1.
olchik [2.2K]
To solve this we are going to use the future value of annuity ordinary formula: FV=P[ \frac{(1+ \frac{r}{n} )^{kt} -1}{ \frac{r}{n} } ]
where
FV is the future value
P is the periodic payment
r is the interest rate in decimal form
n is the number of times the interest is compounded per year
k is the number of payments per year
t is the number of years

We know for our problem that P=6200 and t=5. To convert the interest rate to decimal form, we are going to divide the rate by 100%:
r= \frac{6}{100} =0.06
Since the deposit is made semiannually, it is made 2 times per year, so k=2.
Since the type of the annuity is ordinary, payments are made at the end of each period, and we know that we have 2 periods, so n=2.
Lets replace the values in our formula:

FV=P[ \frac{(1+ \frac{r}{n} )^{kt} -1}{ \frac{r}{n} } ]
FV=6200[ \frac{(1+ \frac{0.06}{2} )^{(2)(5)} -1}{ \frac{0.06}{2} } ]
FV=71076.06

We can conclude that the correct answer is <span>$71,076.06</span>
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Step-by-step explanation:

Using the Pythagorean Theorem, the side needs to be found by subtracting a to c then square root b to get rid of the square. Round 12.96 to 13

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