Reference no: EM131042069
1. At a school pep rally, a group of sophomore students organized a free raffle for prizes. They claim that they put the names of all of the students in the school in the basket and that they randomly drew 36 names out of this basket. Of the prize winners, 6 were freshmen, 14 were sophomores, 9 were juniors, and 7 were seniors. The results do not seem that random to you. You think it is a little fishy that sophomores organized the raffle and also won the most prizes. Your school is composed of 30% freshmen, 25% sophomores, 25% juniors, and 20% seniors.
a. What are the expected frequencies of winners from each class?
b. Conduct a significance test to determine whether the winners of the prizes were distributed throughout the classes as would be expected based on the percentage of students in each group. Report your Chi Square and p values?
c. What do you conclude?
2. A geologist collects hand-specimen sized pieces of limestone from a particular area. A qualitative assessment of both texture and color is made with the following results. Is there evidence of association between color and texture for these limestones? Explain your answer.
|
|
Colour
|
|
Texture
|
Light
|
Medium
|
Dark
|
|
Fine
|
4
|
20
|
8
|
|
Medium
|
5
|
23
|
12
|
|
Course
|
21
|
23
|
4
|
3. Do men and women select different breakfasts? The breakfasts ordered by randomly selected men and women at a popular breakfast place is shown below in the table. Conduct a test for homogeneity at a 5% level of significance
|
|
French Toast
|
Pancake
|
Waffles
|
Omelet
|
|
Men
|
47
|
35
|
28
|
53
|
|
Women
|
65
|
59
|
55
|
60
|
4.
a. Using "size" as the independent variable and "cost" as the dependent variable, draw a scatter plot.
b. Does it appear from inspection that there is a relationship between the variables? Why or why not?
c. Calculate the least-squares line. Put the equation in the form of: y = a + bx
d. Find the correlation coefficient. Is it significant?
e. If the laundry detergent were sold in a 40-ounce size, find the estimated cost.
f. If the laundry detergent were sold in a 90-ounce size, find the estimated cost.
g. Does it appear that a line is the best way to fit the data? Why or why not?
h. Are there any outliers in the given data?
i. Is the least-squares line valid for predicting what a 300-ounce size of the laundry detergent would you cost? Why or why not?
j. What is the slope of the least-squares (best-fit) line? Interpret the slope
|
How we define power wealth class and influence in the us
: Use at least three resources for this paper including your course materials. Refer to the tables and figures in Power and Society as well as the companion website to Who Rules America?
|
|
Measure of association shows
: Can a test of significance show a statistically significant relationship while a measure of association shows a weak relationship between the variables?
|
|
Frame and with the second painter in the top
: Define the below operation for painters. Below takes two painters as arguments. The resulting painter, given a frame, draws with the first painter in the bottom of the frame and with the second painter in the top.
|
|
When do you use snowball sampling
: There are different types of purposeful sampling and this includes typical, maximum variation, unique, convenience, chain, snowball, and theoretical sampling. When do you use snowball sampling ?
|
|
Expected frequencies of winners
: a. What are the expected frequencies of winners from each class? b. Conduct a significance test to determine whether the winners of the prizes were distributed throughout the classes as would be expected based on the percentage of students in each..
|
|
Describe the workflow and organizational structure
: What explicit rewards and status symbols motivate employees? What are the leaders' reactions to critical incidents and crises? Describe the workflow and organizational structure.
|
|
Discuss benefits and challenges of using recovery framework
: The National Recovery Framework is the foundation for mental health practice. In reference to your current clinical setting discuss the benefits and challenges of using the recovery framework.
|
|
Central limit theorem
: A coin is tossed100 times. Estimate the probability that the number of heads lies between 40 and 60. NB: use the Central Limit Theorem.
|
|
Decision regarding the hypothesis
: Let α=0.05. What is your decision regarding the hypothesis? Write your conclusion in a sentence and discuss whether there is sufficient data to support your decision.
|