Reference no: EM131269078
1) A study of violence and peer acceptance reported descriptive results for male and female students. The average age for 17 male students was 15.79 with a standard deviation of 2.01. Construct a 99% confidence interval for the average age of male students. What is the lower bound for this confidence interval?
a. 15.36
b. 13.96
c. 14.50
d. 14.32
2) A research study interested in the adoption of the "urban lifestyle" among delinquent youths surveyed 1,000 delinquent youths and found that their average on the "urban lifestyle scale" is 7.65 with a standard deviation of 1.01. What's the upper bound for a 95% confidence interval?
a. 7.59
b. 7.71
c. 7.04
d. 7.96
3) The US Census shows that 35% of Americans have a passport. We think that in Phoenix, fewer people have passports (Phoenix is a resort town after all, why travel?). We take a sample of 1500 Phoenix residents and find that 31% have a passport. Conduct a hypothesis test around a proportion that tests whether fewer Phoenix residents have passports than the overall US. Use alpha = 0.05. What would be your alternative hypothesis?
a. H1: p < 0.31
b. H1: p > 0.31
c. H1: p < 0.35
d. H1: p > 0.35
4) The US Census shows that 35% of Americans have a passport. We think that in Phoenix, fewer people have passports (Phoenix is a resort town after all, why travel?). We take a sample of 1500 Phoenix residents and find that 31% have a passport. Conduct a hypothesis test around a proportion that tests whether fewer Phoenix residents have passports than the overall US. Use alpha = 0.05. What do you conclude?
a. Fail to reject the null hypothesis.
b. Reject the null hypothesis.
|
|
Driver post-stop perceived race or ethnicity
|
Total
|
|
White
|
Unknown
|
Native American
|
Hispanic
|
Black
|
Asian
|
|
Driver arrested
|
no
|
18005
|
261
|
357
|
5240
|
1867
|
552
|
26282
|
|
yes
|
1010
|
12
|
67
|
562
|
168
|
22
|
1841
|
|
Total
|
|
19015
|
273
|
424
|
5802
|
2035
|
574
|
28123
|
Using the table above, answer the following 2 questions:
5) What is the probability of being arrested or Asian? P(Yes OR Asian)
a. 0.085
b. 0.076
c. 0.087
d. 0.091
6) What is the probability of not being arrested and being Hispanic? P(No Arrest & Hispanic)?
a. 0.211
b. 0.167
c. 0.188
d. 0.192
7) Say you have a table with 4 rows and 2 columns. Using α = 0.01, what would your χ2 critical value be?
a. 3.84
b. 7.81
c. 11.34
d. 12.59
8) Using the following table, what would be the expected frequency for "Routine & Pretty Happy"? Is Life Exciting or Dull * General Happiness Crosstabulation
Count
|
|
General Happiness
|
Total
|
|
Very Happy
|
Pretty Happy
|
Not Too Happy
|
|
Is Life Exciting or Dull
|
Exciting
|
195
|
218
|
21
|
434
|
|
Routine
|
98
|
338
|
61
|
497
|
|
|
Dull
|
2
|
12
|
26
|
40
|
|
Total
|
|
295
|
568
|
108
|
971
|
a. 151
b. 290.7
c. 23.4
d. 55.3
9) Calculate the χ2 for the following table.
Is Life Exciting or Dull * General Happiness Crosstabulation
Count
|
|
General Happiness
|
Total
|
|
Very Happy
|
Pretty Happy
|
Not Too Happy
|
|
Is Life Exciting or Dull
|
Exciting
|
195
|
218
|
21
|
434
|
|
Routine
|
98
|
338
|
61
|
497
|
|
|
Dull
|
2
|
12
|
26
|
40
|
|
Total
|
|
295
|
568
|
108
|
971
|
a. 196.02
b. 156.89
c. 205.36
d. 186.33
10) Given the χ2 you found in the above table, would you reject or fail to reject the null hypothesis? Use an alpha level of 0.01.
a. Reject the null hypothesis
b. Fail to reject the null hypothesis
|
What are the advantages and disadvantages of social media
: What are the advantages and disadvantages of social media? How might knowing these advantages and disadvantages alter how a person might use social media?
|
|
Select a business decision made within the organization
: Select a business decision made within the organization. Identify the potential ethical implications associated with this decision. Determine the effect this may have on the decision making process.
|
|
Analyze the framework of a strategic plan
: Identify the organization's mission, vision, and key values. Analyze the framework of a strategic plan. Evaluate the relationship between the strategic plan and your organization's mission, vision, and values.
|
|
Identify the top three to five factors that would need
: Identify the top three to five factors that would need to be considered when recruiting in your chosen region. Develop a persuasive closing summary that describes why the factors you identified are important.
|
|
Construct a confidence interval for the average age
: A study of violence and peer acceptance reported descriptive results for male and female students. The average age for 17 male students was 15.79 with a standard deviation of 2.01. Construct a 99% confidence interval for the average age of male st..
|
|
Select a business decision made within the organization
: Select a business decision made within the organization. Identify the potential ethical implications associated with this decision. Determine the effect this may have on the decision making process.
|
|
Find a cubic regression equation for the number of hdtvs
: How many ads should be placed each month to maximize the rate of change of sales with respect to the number of ads, and how many HDTVs can be expected to be sold with that number of ads?
|
|
Differences in communication
: "Yes, according to proponents of the "men and women are from different galaxies" school of thought. Women are said to be self-effacing and apologetic. Men, on the other hand, are described as convincingly confident...even when they don't have the ..
|
|
Determine the total impedance in rectangular form
: Given the impedance of each element in rectangular form, write a program to determine the total impedance in rectangular form of any number of series elements.
|