A researcher was interested in comparing the GPAs of students at two different colleges. Independent simple random samples of 8 students from college A and 13 students from college B yielded the following GPAs.

College A: 3.7, 3.2, 3.0, 2.5, 3.4, 2.8, 3.6, 2.7

College B: 3.8, 3.2, 3.0, 3.9, 3.8, 2.5, 2.8, 4.0, 3.6, 2.6, 4.0, 3.6, 3.9

Find a 95% confidence interval for the difference, μ1 - μ2, between the mean GPA of college A students and the mean GPA of college B students. Also, find the margin of error. What is the parameter of interest? What is the underlying distribution?

QUESTION 2

1. Fifty students are enrolled in an Economics class. After the first examination, a random sample of 5 papers

   was selected. The grades were 65, 73, 80, 72, and 95

   a.	Calculate the estimate of the standard error of the mean.
   b.	What assumption must be made before we can determine an interval for the mean grade of all the students in the class? Explain why.
   c.	Assume the assumption of Part b is met. Provide a 90% confidence interval for the mean grade of all the students in the class.
   d.	If there were 200 students in the class, what would be the 90% confidence interval for the mean grade of all the students in the class?

1. [6] Sixty percent of the student body at the University of British Columbia is from British Columbia, 30% percent are from other Canadian provinces and territories, and the remainder are international students. Twenty percent of students from British Columbia live in the dormitories, whereas 50% of students from other Canadian provinces and territories live in the dormitories. Finally, 80% of the international students live in the dormitories.

1. What percentage of University of British Columbia students live in the dormitories?

2. Given that a student lives in the dormitory, what is the probability that she/he is an international student?

3. Given that a student lives in the dormitory, what is the probability that she/he is from British Columbia?

The graph illustrates the distribution of test scores taken by College Algebra students. The maximum possible score on the test was 110, while the mean score was 80 and the standard deviation was 7. 59 66 73 80 87 94 101 Distribution of Test Scores What is the approximate percentage students who scored between 73 and 87 on the test? Incorrect% What is the approximate percentage of students who scored lower than 59 on the test? Incorrect% What is the approximate percentage of students who scored less than 66 on the test? Incorrect% What is the approximate percentage of students who scored between 66 and 94 on the test? Incorrect%

5. For each random variable defined here, describe the set of possible values for the variable, and state whether the variable is discrete. (

a) X = number of unbroken eggs in a randomly chosen standard egg carton

(b) Y = number of students on a class list for a particular course who are absent on the first day of classes

(c) Z = number of times a golfer has to swing at a golf ball before hitting it

(d) A = length of a randomly selected rattlesnake

(e) B = amount of royalties earned from the sale of a first edition of 10,000 textbooks (f) C = the pH of a randomly chosen soil sample

(g) D = the tension (psi) at which a randomly selected tennis racket has been strung (h) E = the total number of coin tosses required for three individuals to obtain a match (HHH or TTT)

Ice Factory, a sno-cone stand, opened on the perimeter of campus two months ago. Initially, Ice Factory selected a pricing objective (strategy) that focused on maximizing volume and revenue as well as encouraging a greater volume of purchases. After two months of selling sno-cones to faculty, staff, and students, business is booming. Ice Factory has decided it is time to evaluate different pricing tactics that will generate additional sales from current customers and also sales from new customers.

In one or more fully formed paragraphs, identify the pricing objective (strategy) used when Ice Factory first opened, then list five pricing tactics Ice Factory can use to generate additional sales, and finally explain in detail how Ice Factory can implement three of those tactics to arrive at a final price for customers.

We have provided a list of three topics below.  Select one that is of interest to you.  For that topic, imagine that you are developing a CIHR Project Grant.  Part of that grant will be to create a thorough and convincing knowledge translation (KT) plan for your study and its findings.  In 400 words or less (that is the maximum space you will have on this grant application), please outline the essential elements of your KT plan as would be included in your grant.

Topic 1.  A randomized trial to investigate a new antiemetic therapy (vs. standard care) for use in the treatment of breast cancer patients undergoing chemotherapy

Topic 2.  A study of gender identity, emotional wellbeing, and academic achievement in Ontario high school students

Topic 3.  A study of occupational of safety conditions on fruit and vegetable farms in the Niagara region and the health of migrant workers

We had plenty of new concepts to study for this week. List one concept and describe it to the class. Do not duplicate concepts described by other students. I will start:

We learned about the Copy Constructor. The C++ supplies each class with a default copy constructor. This function is invoked when a new object is created and initialized or when an object is passed as a value parameter to a function. The default copy constructor performs a shallow copy, the values of the data fields in the exiting object is copied over to the newly created object. The default constructor is enough and works fine if the class has no pointer data field. A class that has a pointer data member that points to allocated memory will need a customized copy constructor (a deep copy) since the default constructor only copies the address the pointer is holding and not the allocated memory. The Course class with the student data member is a good example.

Theory Questions 1.

The Kyrgios Database Group has about 120 employees. Each employee has an ID, a firstname and a surname. Each employee belongs to a department. The organisation has around 6 departments. Each department has a department code and a departmentname. • Create an ERD solution based on the above narrative. ERD Diagram

Question 2.

The Tomic Primary School wishes to democratically choose which animal will become the school mascot. The list of alternatives includes Kangaroo, Koala, Tiger, Elephant, Parrot, Penguin… Each student may vote for one or more of the animals to be the mascot. Each student has a student Id and name. Each of the animals has been assigned a numeric id and name (e.g. 7 Tiger). The school want to be able to store all of the votes made by students in a database. • Create an ERD solution based on the above narrative. ERD Diagram