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just olya [345]
3 years ago
6

Determine what type of observational study is described. Explain. Vitamin D is important for the metabolism of calcium and expos

ure to sunshine is an important source of vitamin D. A researcher wanted to determine whether osteoperosis was associated with a lack of exposure to sunshine. He selected a sample of 250 women with opteoperosis and an equal number of women without osteoperosis. The two groups were matched in other words they were similar in terms of age, diet, occupation, and exercise levels. Histories on exposure to sunshine over the previous twenty years were obtained for all women. The total number of hours that each woman had been exposed to sunshine in the previous twenty years was estimated. The amount of exposure to sunshine was compared for the two groups. a.cohort; Individuals are observed over a long period of time. b.cross-sectional; Information is collected at a specific point in time. c.retrospective; Individuals are asked to look back in time Question 15 4 pts
Mathematics
1 answer:
ICE Princess25 [194]3 years ago
3 0

Answer:

thats too long to read but good luck!

Step-by-step explanation:

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There are 15 copies of a popular cd left to be sold in the store this is between 1% and 1.5% of the original number of copies of
Triss [41]

Answer: The original number of CDs is between 1000 and 1500.

Step-by-step explanation:

Since we have given that

Number of copies of a popular CD left to be sold in the store = 15

According to question, this is between 15 and 1.5% of the original number of copies of the CD in the store.

Let the original number of copies of the CD in the store be 'x'.

Now, 15 is equal to 1% of the original number of copies of the CD, it becomes

1\%\ of\ x=15\\\\\frac{1}{100}\times x=15\\\\x=15\times 100\\\\x=1500

Or if 15 is equal to 1.5% of the original number of copies of the CD, it becomes

1.5\%\ of\ x=15\\\\\frac{1.5}{100}\times x=15\\\\\frac{15}{1000}x=15\\\\x=\frac{15\times 1000}{15}\\\\x=1000

Hence, the original number of CDs is between 1000 and 1500.

3 0
3 years ago
Paola made a rectangular painting that has an area of 24 square feet. He now wants to make a similar
BigorU [14]
Answer:
D.) 10 2/3 square feet
Step-by-step explanation:
The area will change by
multiply the area by 4/9 and you get 32/3 = 10 and 2/3 (because 10 = 30/3)
4 0
2 years ago
Solving by the substitution method<br> y=3x+7<br> y-5x+8
Sveta_85 [38]
3x+7-5x=8
-2x+7=8
-2x=1
X=-1/2
y=3(-1/2)+7
y=-1.5+7
y=5.5
6 0
3 years ago
2) If the sales tax rate is 6.25% in Rio Rancho, how much would the sales tax be for a pair of shoes that cost
Marianna [84]

Answer:

D

Step-by-step explanation:

4 0
3 years ago
What is the slope and equation of a line parallel to the x-axis passing through point (3,7)
Law Incorporation [45]
Thats when point =0. equation of a line mx +b where m is the slope
and b is the intercept
6 0
3 years ago
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