1. Calculate the appropriate percentages for bivariate analysis and provide a brief summary of the relationship between education and divorce using the method of comparing percentage differences discussed in the chapter and in class.

   	Highest Degree
   Ever Been Divorced	School	High School	Junior College	Bachelors Degree	Graduate Degree
   Yes	107	362	55	89	52
   No	285	867	149	374	195

1-Solar Energy

Two school students are arguing: one says that you heat water from the sun’s rays to create energy, the other says that you create energy from electronics that the sun’s rays react with. You are asked to provide no more than 500 words (plus additional diagrams) to explain to the school pupils what is the correct answer to their argument.

Use the data to assess the correlation between hours studying per week in High School and SAT score. Interpret the result and give the conclusion.

Your Mac laptop has both personal financial information and files for all your in-process school projects, including data from research for a major project in one of your classes. This laptop has two equal-sized partitions on the hard drive, and is always with you at home, at school, and at work. Describe how you will ensure the security of your valuable data. Thanks

Joe decides to take a 1-year intensive course in data processing after high school graduation where direct costs=$1,000. Forgone earnings in year 1 are $5,000 from a part-time job.

At the end of this year, Joe can work for a computer company and expects to have earnings of $18,000 at the beginning of the year after his education (discount 1 year from now), $18,500 in year 2 (discount 2 years from now) and $19,000 in year 3 (discount 3 years from now).

If he goes to work with just a high school degree, he will earn $15,500 in each of these three years (we will assume his part-time job becomes full-time).

Interest is 10%.

1. What are the total costs of going to school? These are paid upfront and don’t need to be discounted.

2. What is the PV of the benefits of going to school? The benefit is the extra money he earns from having the certificate. Calculate one PV stream only.

3. Should Joe get the certificate? Why or why not?

In one school district, there are 89 elementary school (K-5) teachers, of which 18 are male (or male-identifying). In a neighboring school district, there are 102 elementary teachers, of which 17 are male. A policy researcher would like to calculate the 99% confidence interval for the difference in proportions of male teachers.

To keep the signs consistent for this problem, we will calculate all differences as p1−p2. That is, start with the percentage from the first school district and then subtract the percentage from the second district. Failing to do so may end up with “correct” answers being marked as wrong.

Point estimate for the percentage males in the first district:
      ˆp1=
Point estimate for the percentage males in the second district:
      ˆp2=
Point estimate for the difference in percentages between the two districts:
      ˆp1−ˆp2=

Estimate of the standard error for this sampling distribution (distribution of differences):
      √ˆp1(1−ˆp1)n1+ˆp2(1−ˆp2)n2=

Critical value for the 99% confidence level:
      zc.v.=

99% margin of error:
      M.E.=

99% confidence interval:

≤p1−p2≤

For each of the following ​situations, explain how you could select a sample using the named sampling procedure.

A. There are 100 kindergarten classes in the school system. You want to use multistage cluster sampling to select a sample of 100 children.

B. There are 220 principals in the school​ system, and you want to use simple random sampling to select a random sample of 40 participants.

C. There are 240 principals in the school​ system, and there are approximately twice as many secondary principals as elementary principals. You want to use stratified sampling to select a sample of 45 principals to ensure proportional representation.

D.  You have a directory that lists the names and addresses of​ 12,000 teachers. You want to use systematic sampling to select a sample of​ 2,400 teachers.

E. You want to survey the attitudes of parents affiliated with one elementary school. What would be an example of using convenience sampling to select a​ sample?

F. You want to sample principals who are known for supporting multicultural diversity in their schools. What would be an example of using snowball sampling to select a​ sample?

1. An educational researcher interested in the consistency of school absenteeism over time studied a sample of 8 high school students for whom complete high school records were available. The researcher counted the number of days of school each student missed while in the sixth grade and how many they missed while in the tenth grade. He obtained the following results:

                        Student # Days Missed in 6^th Grade                        # Days Missed in 10^th Grade          

                        A                                        4                                                                  10

                        B                                        2                                                                   4

                        C                                       21                                                                  11

                        D                                        1                                                                   3

                        E                                        3                                                                   1

                        F                                        5                                                                   5

                        G                                        4                                                                   9

                        H                                        8                        5                                         

1. What is the strength and the direction of the association between the number of days missed in sixth grade and the number of days missed in tenth grade. Be sure to provide the statistic on which your answer is based.
2. Can the correlation be generalized to the larger population of students? (You will need to perform a hypothesis test.) Explain your answer and show all necessary work.xplain your answer. You should write out the research and null hypotheses in Greek notation.

A sample of College Graduates from Rhode Island Colleges and Universities was taken where men and women were asked when they figured out what their college major was going to be. Use the data being represented in the table to answer the following questions.

Before High School
High School Freshman Year
Sophomore Year
Totals
Male 4 22 56 37 119 Female 12 29 42 31 114 Totals 16 51 98 68 233
a. (4 pts.) What is the probability you choose a person at random from your sample and they figured out what their college major was going to be either Before High School or in High School?
b. (4 pts.) What is the probability you choose a person at random from your sample and they are a Female and figured out their College Major their Freshman Year?
c. (4 pts.) What is the probability you choose a person at random from your sample and they figured out what their college major was going to be their Sophomore Year given that they are a Male?

in.java

Two companies donated money on two occasions. Write a program that:

• asks for 2 names of companies
• aks how much each of the given companies donated for Christmas.
• aks how much each of the given companies donated for school support
• prints the total donations for Christmas
• prints the total donations for school support
• prints which one of 2 companies donated more money in general.

For clarity, in the sample runs below, the user input is shown in blue. The black text is printed by the program.
Notice that the company name (entered by the user) shows in the following questions. For example see: "AC4Ever donated: ", "RockOn donated: "

---- Sample run 1
Enter the first company: AC4Ever 
Enter the second company: RockOn 
Enter how much each company donated for Christmas gifts:
AC4Ever donated: 2000
RockOn donated: 1700
Enter how much each company donated for school support:
AC4Ever donated: 3000
RockOn donated: 2500
Total Christmas donations: 3700
Total school support donations: 5500
The company that donated the most is: AC4Ever
Bye