Northwood and Eastwood are rival schools that wish to compare how their students did in a math competition. 72 randomly chosen Northwood students participated and received a mean score of 28 with a standard deviation of 8, 98 randomly chosen Eastwood students participated and received a mean score of 25 with a standard deviation of 10.
-I got the test statistic, but get lost when calculating the p-value and the degrees of freedom.
(a) The Eastwood math teacher wants to show through statistics that
her students receive a higher mean score in the contest. State her
hypotheses.
(b) Compute the test statistic and p-value for this test.
(c) Reach your conclusion at the 0.05 significance level. Be sure to
interpret in the context of the problem.
(d) In a separate test, the Eastwood teacher finds evidence that
Eastwood students performed better than Southwood students. Would
this prove that the Eastwood teacher was more effective than the
Southwood teacher? Explain briefly.
In: Statistics and Probability
4. Consider the following research hypothesis and the p-value obtained via a statistical test. Would this testing have involved one-sample or two-sample hypothesis testing? Does the scenario involved paired or independent samples? Assuming the appropriate testing was used, what would be an appropriate conclusion to draw given the reported results and p-value? Explain the reasoning for your answers. The hypothesis is that students who are familiar with the Theory of Algorithms learn the programming language C++ faster than students who are not familiar with this theory. We have gathered data from 30 students who are familiar with the Theory of Algorithms (Group 1) and 30 students who are not familiar with the Theory of Algorithms (Group 2). Experiments showed students from Group 1 took a mean of 32.5 hours to complete the training course of C++, while students Group 2 the mean was 42.1 hours. The p-value was 0.14
In: Computer Science
In: Accounting
There are 50 students in a classroom at UT-Almost. Thirty of these students started as freshmen at UTA; the rest are transfers. The transfer students are split evenly between business majors and liberal arts majors. the total number of business majors is 25. (use for both questions)
#13 – If we randomly selected a single student, what is the probability he/she will be either a liberal art major or a transfer student?
ANSWER:
#16 – Suppose we randomly selected two students using this process: We take 40 envelopes and insert a slip of paper (either red or white) into each one. Each envelope is then sealed and then placed in a big box from which students draw one envelope each. The student who draw envelopes with red slips inside them are selected. Two of the envelopes contain red slips; the rest contain white. What is the probability that both students selected will be transfers?
ANSWER:
In: Statistics and Probability
suppose 10 students get A's, 2 Students get B's 3 Students get C's, and one student gets an F
If a committee is formed with 3 people, what is the probability that there are two people with an A and 1 with a C?
What is the probability of selecting a grade A student for the first time on either the 2nd or 3rd selection?
In: Statistics and Probability
An outbreak of this disease in New York City in 1999 was originally diagnosed as St. Louis Encephalitis, but it was later determined that it was actually ________.
In New York City, health officials discovered that the mosquitos were the _________, or delivery agent that helped spread the West Nile Virus
In epidemiology, there are three important questions that all epidemiologists will ask. What are they?
What was the notifiable disease mentioned in the class lecture?
The AIDS epidemic in the United States can be traced back to 1981 when what rare cancer was seen in homosexuals?
All of the following are examples of epidemiological studies except:
This condition was discovered in July 1976 at an American Legion 4-day convention held in Philadelphia.
In: Nursing
Explain the possible correclation where both perpetrators and victims of violent crimes are likely to have consumed alcohol prior to certain aggressive acts, such as rape, assault, domestic violence, and murder (Collins and Messerschmidt 1993; Arseneault et al.2000; Cunradi et al. 1999; Scott et al. 1999).
ARSENEAULT, L.; MOFFITT, T.E.; CASPI, A.; TAYLOR, P.J.; AND SILVA, P.A. Mental disorders and violence in a total birth cohort: Results from the Dunedin Study. Archives of General Psychiatry 57:979–986, 2000.
COLLINS, J.J., AND MESSERSCHMIDT, M.A. Epidemiology of alcohol-related violence. Alcohol Health & Research World 17:93–100, 1993.
CUNRADI, C.B.; CAETANO, R.; CLARK, C.L.; AND SCHAFER, J. Alcohol-related problems and inti mate partner violence among white, black, and Hispanic couples in the U.S. Alcoholism: Clinical and Experimental Research 23:1492–1501, 1999.
SCOTT, K.D.; SCHAFER, J.; AND GREENFIELD, T.K. The role of alcohol in physical assault perpetration and victimization. Journal of Studies on Alcohol 60:528–536, 1999.
In: Psychology
| BOXPLOT & WHISKERS | |||||||||||||
| Student ID | Score pre training | Score post training | Scenario: | ||||||||||
| 102 | 50 | 75 | You work for the Medical Center's Corporate Education Department. You developed a new | ||||||||||
| 442 | 60 | 75 | leadership program as part of the Center's succession plan. You had your first cohort of | ||||||||||
| 325 | 65 | 85 | managers successfully complete the training program. Each participant completed pre- | ||||||||||
| 154 | 75 | 90 | assessment before starting the classroom instruction and a post-assessment following the | ||||||||||
| 114 | 80 | 95 | completion of the program. You are expected to prepare a BOXPLOT & WHISKER diagram for | ||||||||||
| 178 | 40 | 75 | each group of data (score before training & score post training). | ||||||||||
| 165 | 60 | 80 | |||||||||||
| 520 | 90 | 90 | Please provide your interpretation of the results. For example, you might want to compare | ||||||||||
| 220 | 80 | 85 | the two diagrams and point out the similarties and differences. You may want to share some | ||||||||||
| 335 | 60 | 85 | relevant descriptive statistics about the two groups of data. | ||||||||||
In: Statistics and Probability
Several companies have done a poor monitoring of the social aspects of the external environment. This meant that their strategies did not fit the needs of the market, and hence they failed. This is most noticeable among firms who market to Generation Y. This target group consists of customers who range in age from 5 to 20. Dubbed Gen Y" this cohort presented a big challenge to marketers such as Levi Strauss, Nike and Pepsi because of their unique tastes and perceptions of product quality and advertising themes.
Companies that succeeded in reaching Generation Y customers accurately sensed the unique needs of this market. For example, Lee Apparel (a competitor of Levi Strauss) introduced a special line of oversized, multipocketed pants aimed at 10-14 year old boys. This unique product was marketed on the internet, outdoor posters, and skateboard magazines. By carefully customizing their marketing, successful companies (such as Coca-Cola, Tommy Hilfiger, and Motorola) penetrated a market which was seen as impregnable by others.
While it is difficult to accurately forecast social changes, how can firms best factor these changes into their strategies in order to be successful?
In: Operations Management
calculate an independent t-test and describe the results.
Use the following for the standard deviations:
.555 for the group without a support system
.324 for the group with a support system
You are a researcher examining student success at Kern County colleges and universities. You noticed that majority of students in Kern County are not performing as well as the students in Los Angeles County and San Luis Obispo County. Therefore, you decided to research factors that influence student success. One factor repeated in several literatures is a support system. Previous literature indicated that students who have a support system that values education will perform better in higher education than students who do not have a support system that values education. You decided to assess the support system of students in Kern County. Your independent variable is “support system.” You have two levels for your support system “students with a support system that values education” and “students without a support system that values education.” Your dependent variable that you are measuring is “college success.” You are measuring college success by assessing the student’s GPA. You interview 80 students with and without support systems and measured their GPAs. You obtained 41 student participants with a support system and 39 students without a support system. With the results obtained from the data, you will be able to generalize from the sample of 41 Kern County colleges and universities students to the population of all students in Kern County colleges and universities. Here is the GPA data that you obtained:
|
Students with Support System that Values Education |
|
4 |
|
3.9 |
|
3.8 |
|
3.7 |
|
3.5 |
|
3.2 |
|
3 |
|
4 |
|
3.8 |
|
3.7 |
|
3.6 |
|
3.1 |
|
3.2 |
|
3.8 |
|
3.7 |
|
3.9 |
|
3.9 |
|
3.7 |
|
3.7 |
|
3.6 |
|
3.5 |
|
3.1 |
|
3.3 |
|
3.3 |
|
3.2 |
|
3.5 |
|
3.4 |
|
3.1 |
|
2.9 |
|
3 |
|
2.9 |
|
3.3 |
|
3.4 |
|
3.6 |
|
3.4 |
|
3.5 |
|
3.6 |
|
3.8 |
|
3.1 |
|
4 |
|
3.8 |
|
Students without Support System that Values Education |
|
3.8 |
|
3.7 |
|
2.9 |
|
2.8 |
|
2.6 |
|
2.4 |
|
3 |
|
3.4 |
|
2.6 |
|
2.5 |
|
2.3 |
|
2.1 |
|
2 |
|
3 |
|
3.1 |
|
2.7 |
|
2.5 |
|
2.4 |
|
2.4 |
|
3.1 |
|
3.2 |
|
3.6 |
|
3.9 |
|
4 |
|
2.1 |
|
2.5 |
|
2.6 |
|
2.4 |
|
2.7 |
|
3.4 |
|
3.2 |
|
3.1 |
|
3.8 |
|
3.7 |
|
2.4 |
|
2.1 |
|
2.6 |
|
2.8 |
|
2.7 |
In: Statistics and Probability