Health: Which would explain why there is a growing trend of obesity in kids Aged 2-19

Answer: B. Unhealthy eating choices are more prevalent due to an increase in availability and accessibility....

Which would explain why there is a growing trend, №15230023, 21.09.2022 15:24

Mathematics

There has been a trend toward less driving in the last few years, especially by young people. From 2001 to 2009, the annual vehicle miles traveled by people decreased. Assume the standard deviation was 2000 miles in 2009. Suppose you would like to conduct a survey to develop a 90% confidence interval of the annual vehicle-miles per person for people. A margin of error of 100 miles is desired. How large of a sample should be used for the survey?

Step-by-step answer

P Answered by PhD

The sample size is used for the survey (n) = 1082

Step-by-step explanation:

Explanation:-

Step(i):-

Given data There has been a trend toward less driving in the last few years, especially by young people. From 2001 to 2009

Assume the standard deviation was 2000 miles in 2009

Given the Population standard deviation 'σ' = 2000 miles

Given the margin of error at 90% of confidence interval

Margin of error = 100 miles

The z- score value at 90% of confidence interval = 1.645

Step(ii):-

The Margin of error is determined by

$M.E = \frac{Z_{\alpha }S.D }{\sqrt{n} }$

$M.E X \sqrt{n} = Z_{\alpha } S.D$

Now the sample size $\sqrt{n} = \frac{Z_{\alpha } S.D}{Marginerror} = \frac{1.645 X 2000}{100}$

√n = 32.9

squaring on both sides , we get ' n ' = 1082.41

Final -

The sample size is used for the survey (n) = 1082

Mathematics

There has been a trend toward less driving in the last few years, especially by young people. from 2001 to 2009 the annual vehicle miles traveled by people from 16 to 34 years of age decreased from 10,300 to 7900 miles per person (u.s. pirg and education fund website, april 6, 2012). assume the standard deviation was 2000 miles in 2009. suppose you would like to conduct a survey to develop a 95% confidence interval estimate of the annual vehicle-miles per person for people 16 to 34 years of age at the current time. a margin of error of 100 miles

Step-by-step answer

P Answered by PhD

1

1537.

Step-by-step explanation:

Formula for sample size :-

$n=(\dfrac{z_{\alpha/2}\cdot \sigma}{E})^2$

Given : $\sigma=2000$

Margin of error : E= 100

Critical value of 95% confidence : $z_{\alpha/2}=1.96$

Now, the required sample size will be :-

$n=(\dfrac{1.96\cdot 2000}{100})^2\\\\=1536.64\approx1537$

Hence, the minimum sample size required = 1537.

Mathematics

There has been a trend toward less driving in the last few years, especially by young people. From 2001 to 2009, the annual vehicle miles traveled by people decreased. Assume the standard deviation was 2000 miles in 2009. Suppose you would like to conduct a survey to develop a 90% confidence interval of the annual vehicle-miles per person for people. A margin of error of 100 miles is desired. How large of a sample should be used for the survey?

Step-by-step answer

P Answered by PhD

The sample size is used for the survey (n) = 1082

Step-by-step explanation:

Explanation:-

Step(i):-

Given data There has been a trend toward less driving in the last few years, especially by young people. From 2001 to 2009

Assume the standard deviation was 2000 miles in 2009

Given the Population standard deviation 'σ' = 2000 miles

Given the margin of error at 90% of confidence interval

Margin of error = 100 miles

The z- score value at 90% of confidence interval = 1.645

Step(ii):-

The Margin of error is determined by

$M.E = \frac{Z_{\alpha }S.D }{\sqrt{n} }$

$M.E X \sqrt{n} = Z_{\alpha } S.D$

Now the sample size $\sqrt{n} = \frac{Z_{\alpha } S.D}{Marginerror} = \frac{1.645 X 2000}{100}$

√n = 32.9

squaring on both sides , we get ' n ' = 1082.41

Final -

The sample size is used for the survey (n) = 1082

Mathematics

There has been a trend toward less driving in the last few years, especially by young people. from 2001 to 2009 the annual vehicle miles traveled by people from 16 to 34 years of age decreased from 10,300 to 7900 miles per person (u.s. pirg and education fund website, april 6, 2012). assume the standard deviation was 2000 miles in 2009. suppose you would like to conduct a survey to develop a 95% confidence interval estimate of the annual vehicle-miles per person for people 16 to 34 years of age at the current time. a margin of error of 100 miles

Step-by-step answer

P Answered by PhD

1

1537.

Step-by-step explanation:

Formula for sample size :-

$n=(\dfrac{z_{\alpha/2}\cdot \sigma}{E})^2$

Given : $\sigma=2000$

Margin of error : E= 100

Critical value of 95% confidence : $z_{\alpha/2}=1.96$

Now, the required sample size will be :-

$n=(\dfrac{1.96\cdot 2000}{100})^2\\\\=1536.64\approx1537$

Hence, the minimum sample size required = 1537.

Chemistry

PLEASE HELP THEY ARE EASY QUESTIONS THERE ARE JUST A LOT Please answer these. The tables needed for question 7 are in the picture. I got rid of some of the questions that you wouldn’t be able to answer without doing the lesson Question 1: Electron Notation Example (2 points) a. Give the electron configuration of vanadium (V), atomic number 23. (0.5 points) b. Give the noble gas configuration of vanadium (V), atomic number 23. (0.5 points) c. List the energy levels for the orbital configuration of vanadium (V), atomic number 23. (1 point) Question

Step-by-step answer

P Answered by Master

5

some of the answers are in order below.

Explanation:

1s2 2s2 2p6 3s2 3p6 4s2 3d3

(Ar) 4s2 3d3

n=1 is the first energy level: 1s2

n=2 is the second energy level 2s2 3p6

n=3 is the third energy level 3s2 3p6 3d3

n=4 is the fourth energy level: 4s2

First ionization decreases going down the periodic table. But it increases going across the periodic table (left to right)

Electronegativity increases going across the periodic table (from left to right), and it decreases going down the periodic table.

Atomic radius increases going down the periodic table (more energy levels) and decreases going across (larger number of protons pull electrons closer to the nucleus)

A. Ionic bond_B_ Sharing of electrons

B. Covalent bond_C Freely moving electrons

C. Metallic bond_A_ Transfer of electrons

A dipole –dipole forces are occurring between positive end of one polar molecule and a negative end of another polar molecule.

Hydrogen bonding is when hydrogen atom bonded to oxygen, nitrogen or fluoride is attracted to another oxygen, nitrogen or fluoride atom.

Van der Waals forces are intermolecular forces that form because there is fluctuation within an electric cloud, with more electrons on one side of an atom then the other causing slight polarity in nonpolar molecules.

The cell membranes are non-polar lipids, and polar molecules cannot pass through it easily. Some small polar molecules (medicine) can diffuse through the lipid layer easily but larger cannot. (research more)

The strongest bond is H –H bond. The weakest is I-I bond.

These are the measures of average bond energies of the most common bonds present.

S can bond with I and N in many different bond energies.

Triple bond has the highest bonding energy and it is the strongest bond, then double and the weakest is single bond.

etc etc..

Chemistry

PLEASE HELP THEY ARE EASY QUESTIONS THERE ARE JUST A LOT Please answer these. The tables needed for question 7 are in the picture. I got rid of some of the questions that you wouldn’t be able to answer without doing the lesson Question 1: Electron Notation Example (2 points) a. Give the electron configuration of vanadium (V), atomic number 23. (0.5 points) b. Give the noble gas configuration of vanadium (V), atomic number 23. (0.5 points) c. List the energy levels for the orbital configuration of vanadium (V), atomic number 23. (1 point) Question

Step-by-step answer

P Answered by Specialist

5

some of the answers are in order below.

Explanation:

1s2 2s2 2p6 3s2 3p6 4s2 3d3

(Ar) 4s2 3d3

n=1 is the first energy level: 1s2

n=2 is the second energy level 2s2 3p6

n=3 is the third energy level 3s2 3p6 3d3

n=4 is the fourth energy level: 4s2

First ionization decreases going down the periodic table. But it increases going across the periodic table (left to right)

Electronegativity increases going across the periodic table (from left to right), and it decreases going down the periodic table.

Atomic radius increases going down the periodic table (more energy levels) and decreases going across (larger number of protons pull electrons closer to the nucleus)

A. Ionic bond_B_ Sharing of electrons

B. Covalent bond_C Freely moving electrons

C. Metallic bond_A_ Transfer of electrons

A dipole –dipole forces are occurring between positive end of one polar molecule and a negative end of another polar molecule.

Hydrogen bonding is when hydrogen atom bonded to oxygen, nitrogen or fluoride is attracted to another oxygen, nitrogen or fluoride atom.

Van der Waals forces are intermolecular forces that form because there is fluctuation within an electric cloud, with more electrons on one side of an atom then the other causing slight polarity in nonpolar molecules.

The cell membranes are non-polar lipids, and polar molecules cannot pass through it easily. Some small polar molecules (medicine) can diffuse through the lipid layer easily but larger cannot. (research more)

The strongest bond is H –H bond. The weakest is I-I bond.

These are the measures of average bond energies of the most common bonds present.

S can bond with I and N in many different bond energies.

Triple bond has the highest bonding energy and it is the strongest bond, then double and the weakest is single bond.

etc etc..

StudenGPT

Marks Test 4 – are out Take the best 4 marks out of 5 tests (on the system!!) --- how will you approach Test 5 ? Opportunity to improve mark? TEST 5 – Cooper – planation slavery 10 x questions (5 march each = 50) Multiple choice / True or false 45 minutes (available 9 – 10 am) Compulsory reading Plantation Slavery on the East Coat of Africa Chapter 2 Traders and Planters: the development of the clove cultivation in Zanzibar This is a chapter in a book – this is different from a research article in that the author has a lot more pages to develop

Step-by-step answer

P Answered by Studen AI

1

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