Biostatistics Other Assignment Help. Biostatistics Other Assignment Help.
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1. The mean body mass index (BMI) for boys age 12 is 23.6. An investigator wants to test if the BMI is higher in 12-year-old boys living in New York City. How many boys are needed to ensure that a two-sided test of hypothesis has 80% power to detect a difference in BMI of 2 units? Assume that the standard deviation in BMI is 5.7.
=
Alpha = ________
Z1-α/2= ________
Z1-β = ________
ES = ________
n= ________
2. An investigator wants to estimate caffeine consumption in high school students. How many students would be required to estimate the proportion of students who consume coffee? Suppose we want the estimate to be within 5% of the true proportion with 95% confidence.
Alpha = ________
Z= ________
p= ________
Effect Size = ________
n= ________
3. A crossover trial is planned to evaluate the impact of an educational intervention program to reduce alcohol consumption in patients determined to be at risk for alcohol problems. The plan is to measure alcohol consumption (the number of drinks on a typical drinking day) before the intervention and then again after participants complete the educational intervention program. How many participants would be required to ensure that a 95% confidence interval for the mean difference in the number of drinks is within 2 drinks of the true mean difference? Assume that the standard deviation of the difference in the mean number of drinks is 6.7 drinks.
Z= ________
s= ________
Effect Size = ________
n= ________
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Leadership question help Business Finance Assignment Help
Which best describes the reason situational leadership is so practical for managers to use?
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Write a complete, balanced equation for this double displacement reaction. Science Assignment Help
<span style="font-size:9.0pt;mso-bidi-font-family:Arial;color:black;layout-grid-mode:
both”>Write a complete, balanced equation for this double displacement
reaction. (Hint: The solid is a compound of
<span style="font-size:9.0pt;mso-bidi-font-family:Arial;color:black;layout-grid-mode:
both”>Ni 2 ions and hydroxide ions.) Write the
complete molecular equation rather than the net ionic equation.
For this lab the substances that I used were:
- Add 15 mL of 1 M sodium hydroxide (NaOH) solution from the Materials shelf to one of the beakers.
- Add 6 mL of nickel (II) chloride solution (NiCl2) from the Materials shelf to the other, empty, beaker.
- Then they were poured together
<span style="font-size:9.0pt;mso-bidi-font-family:Arial;color:black;layout-grid-mode:
both”>
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2002 Chevy Impala 3.8L Transmission Other Assignment Help
Hello, I am trying to help a friend with a problem,he has a 2002 Chevy impala 3.8L. The car was running just fine got a transmission service then about 2 months later he comes out to go to work and puts it into gear and nothing. Revs the engine and hit goes into gear very hard. once in gear drives fine goes through all the gears just fine. once the car is warmed up it will go into gear fine just from a cold start it takes a second to go into gear and it hits VERY HARD. I am very machanically inclined but with auto trans the only thing i now is to replace them, he just does have the money to do it in a shop and i really dont want to replace the transmission on the ground ( pain in the a$$) ive been reading up on these cars and alot of people are talkin about cleaning or replacing the valve body and/or Torque Converter clutch solenoid. So my question is could this be a problem.. done want to do the transmission if i dont have too.. plus hes not keepin the car pass jan. 1
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driving problems Other Assignment Help
2005 dodge neon sxt, after doing the exhaust headers on the car, after about 2 weeks my car started to make popping noises from the exhaust when i hit the gas from a dead stop or going slow to a faster speed, i did have 2 vaccum leaks im pretty sure i fixed it, any suggestions?, it takes a few to actually build up speed after the multiple popping noises and also it seems to almost stall when going in reverse like it wants to, when im at a red light for a while the car starts to feel like its rough idle then abut to die and then stops multiple times, please help i dont know what else to do
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please help within five minutes Science Assignment Help
2Cu+(aq) + Pb(s) → Pb2+(aq) + 2Cu(s)
Species | Cu+(aq) | Cu(s) | Pb2+(aq) | Pb(s) |
ΔGof (kJ/mol) | 50.2 | 0 | -24.3 | 0
ΔGorxn = -124.7 kJ/mol |
please help within five minutes Science Assignment Help[supanova_question]
java help ASAP Programming Assignment Help
this is a java program which I am working on but it has been along time since I used java and am really lost. I am suppose to code the sections which I marked in the project please help me.
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Arrays;
import java.util.Scanner;
/**
*
public class AlumniFinder {
/**
* Read in a file containing student records and create an array of Student
* objects
*
* @param file The filename
* @param num The number of students in the file
* @return An array of Student objects
*/
static Student[] readStudentsFromFile(String filename, int num) {
try (Scanner in = new Scanner(new File(filename))) {
Student[] students = new Student[num];
// YOUR CODE HERE
// Hints:
// To read a line from the file you can call
//String line = in.nextLine();
// The split method of the String class might come in handy to get the fields
return students;
} catch (FileNotFoundException e) {
e.printStackTrace();
return null;
}
}
/**
* Write an array of Student objects to a file
*
* @param students The array of Student objects to write out
* @param filename The output filename
*/
static void writeStudentsToFile(Student[] students, String filename) {
try (FileWriter out = new FileWriter(filename)) {
// YOUR CODE HERE
// Hints:
// To write a line to the file you can call
// out.write(“Hello World!” + “n”);
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Find students belonging to both groups.
*
* This function checks each student in group1 for membership in group2 by
* comparing it with every student in group2.
*
* @param group1 A group of Students
* @param group2 A group of Students
* @param numCommon number of students belonging to both groups
* @return An array of Students which belong to both group1 and group2
*/
static Student[] findCommonStudents1(Student[] group1, Student[] group2,
int numCommon) {
Student[] common = new Student[numCommon];
// YOUR CODE HERE
return common;
}
/**
* Find students belonging to both groups.
*
* This function checks each student in group1 for membership in group2 by
* doing a binary search on group2.
*
* @param group1 A group of Students
* @param group2 A group of Students
* @param numCommon number of students belonging to both groups
* @return An array of Students which belong to both group1 and group2
*/
static Student[] findCommonStudents2(Student[] group1, Student[] group2,
int numCommon) {
Student[] common = new Student[numCommon];
// YOUR CODE HERE
// Hints:
// To sort an array of Comparables you can call
//Arrays.sort(arr);
// To search for an element in a sorted array you can call
// Arrays.binarySearch(arr, element)
// if the returned index is >= 0, the element was found at that index
return common;
}
/**
* @param args
*/
public static void main(String[] args) {
/***** These files provided to help you with initial testing *****/
Student[] uc = readStudentsFromFile(“sample_uc_students.txt”, 10);
Student[] cs = readStudentsFromFile(“sample_cs_grads.txt”, 5);
final int cs_UC_GradsNumber = 2;
/***** Use these files for the output you submit *****/
//Student[] uc = readStudentsFromFile(“uc_students.txt”, 350000);
//Student[] cs = readStudentsFromFile(“cs_grads.txt”, 75000);
//final int cs_UC_GradsNumber = 25000;
long start, end;
start = System.currentTimeMillis();
Student[] common1 = findCommonStudents1(uc, cs, cs_UC_GradsNumber);
end = System.currentTimeMillis();
System.out.println(“Cross checking took ” + (end – start) / 1000.0
+ ” seconds.”);
Arrays.sort(common1);
writeStudentsToFile(common1, “cs_grads_at_uc_1.txt”);
start = System.currentTimeMillis();
Student[] common2 = findCommonStudents2(uc, cs, cs_UC_GradsNumber);
end = System.currentTimeMillis();
System.out.println(“Using binary search it took ” + (end – start)
/ 1000.0 + ” seconds.”);
Arrays.sort(common2);
writeStudentsToFile(common2, “cs_grads_at_uc_2.txt”);
}
}
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1998 Nissan Maxima won’t start – think it is anti theft system Other Assignment Help
I have a 1998 Nissan Maxima. Yesterday when I went to leave work it wouldn’t start. The engine would just make one click when I tried to turn the key. The battery is working fine. I also replaced the starter in February of this year, so shouldn’t be starter. I had someone hook up with jumper cables for 30 minutes just in case and it still just clicked when i tried to start it. It won’t even try to turn over. The lights and air all work fine, so I know the battery is fine. This happened a few months ago, and a Nissan mechanic who just happened to see me broke down told me it was the anti theft security system. He it turns on something that keeps the engine from starting if it gets tripped. I didn’t get his information so I have no way of contacting this mechanic. I guess I don’t remember what he did to reset it. I thought he unplugged the battery for 15 minutes, put the car in neutral and it started right up. When I tried it it didn’t work, and i have tried several times in neutral and park. I have tried removing the fuse for antitheft system and unplugging the battery for 15 minutes and plugging back in, this also did nothing. I have tried turning the key in the driver side door slowly back and forth, as well as the passenger door. This also did nothing. I am out of things to try.
Can you help??
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Networking Assignment Computer Science Assignment Help
Ethernet is a common method of moving packets along a network.
Review the Advanced Ethernet Switching modes in your Business
Data Networks and Telecommunications textbook.
Write a 4– to 7-page paper describing these modes and how they
might be used in today’s global network environment.
Include the following in your paper:
• Distinguish the basics between channels and circuits.
• Explain the concept of Ohm’s law and its importance to
circuit troubleshooting.
• Compare circuit and packet-switched networks.
• Based on your readings, define the network protocols and
how they provide safety against communications failure.
• Identify which types of businesses would most benefit from
15
this type of technology.
• Provide examples of what currently available systems can be
enhanced and where additional opportunities exist.
• Explain how the current network architecture equipment can
be used or must be upgraded to allow for your recommended
uses
Format your paper consistent with APA guidelines.
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please help within five minutes Science Assignment Help
2Cu+(aq) + Pb(s) → Pb2+(aq) + 2Cu(s)
Species | Cu+(aq) | Cu(s) | Pb2+(aq) | Pb(s) |
ΔGof (kJ/mol) | 50.2 | 0 | -24.3 | 0
ΔGorxn = -124.7 kJ/mol |
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