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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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The circumference of a circle is 24 feet. What is the approximate length of the radius? Round to the nearest tenth​
jarptica [38.1K]
<h3><u>given</u><u>:</u></h3>

circumference= 24 feet

<h3><u>to</u><u> </u><u>find</u><u>:</u></h3>

the radius of the circle.

<h3><u>solution</u><u>:</u></h3>

c = 2\pi \: r

r =  \frac{c}{2\pi}

r =  \frac{24}{2 \times \pi}

r = 3.81972

r = 3.8 \: ft

<u>therefore</u><u>,</u><u> </u><u>the</u><u> </u><u>radius</u><u> </u><u>of</u><u> </u><u>the</u><u> </u><u>circle</u><u> </u><u>is</u><u> </u><u>3.8</u><u> </u><u>feet</u><u>.</u>

4 0
2 years ago
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Need help on 4,5 pleasesss
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7 0
3 years ago
Paula is cutting lengths of ribbon to decorate her home for a party. She needs 40 pieces of ribbon that are all 4 feet 5 inches
Phantasy [73]
The answer is the first one because 4 feet 5 inches times 40 is 176 feet and 8 inches
5 0
3 years ago
Two sides of a triangle are 8 m and 9 m in length and the angle between them is increasing at a rate of 0.06 rad/s. Find the rat
Lelechka [254]
<h2>Rate at which area is increasing is 1.08 m²/s.</h2>

Step-by-step explanation:

Area of triangle is with side a and b and angle C between them is given by

                             A = 0.5 ab SinC

Here we need to find how area changes with  a and b fixed and C is changing,

                       \frac{dA}{dt}=\frac{d}{dt}\left (0.5 absinC\right )\\\\\frac{dA}{dt}=0.5ab\frac{d}{dt}\left (sinC\right )\\\\\frac{dA}{dt}=0.5abcosC\frac{dC}{dt}

We have

                 a = 8 m

                 b = 9 m

                 C=\frac{\pi}{3}rad\\\\\frac{dC}{dt}=0.06rad/s

Substituting

                 \frac{dA}{dt}=0.5\times 8\times 9\times cos\left ( \frac{\pi}{3}\right )\times 0.06\\\\\frac{dA}{dt}=1.08m^2/s

Rate at which area is increasing is 1.08 m²/s.

4 0
3 years ago
Tim wants to ride his bike for 25 miles or less on some mountains bike trails . The table shows the distance of three different
Basile [38]

yo sup??

the sum of trails taken should be less than 25 miles

Black bear=B

Eagle Ridge=E

Doe Run=D

(btw names sound cool XD)

we will now try different combinations

B+E=7 1/2 ++ 10 1/4 which is clearly less than 25

B+D=7 1/2 + 8 3/4 which also less than 25

E+D=10 1/4 + 8 3/4 which is also less than 25

B+D+E=7 1/2 + 10 1/4 + 8 3/4 which is greater than 25

Therefore only the 1st,2nd and 3rd case are possible

Hope this helps.

7 0
3 years ago
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