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PSYC 2525 Null Hypothesis And The Research Hypothesis

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PSYC 2525 Null Hypothesis And The Research Hypothesis

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Course Code: PSYC 2525
University: Louisiana State University

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Country: United States

Questions:

1.Given the following, what should you conclude? t(24) = 2.001 and tcritical = 1.94
2.What is another term that statisticians use when talking of dependent tests? Explain. 
3.Identify which of the following is the formulas are used for calculating a t value for an independent samples and a dependent samples test?

Answer:
Given the following, what should you conclude?
t(24) = 2.001 and tcritical = 1.94 
Get rid of the null hypothesis and take the research hypothesis 

What is another term that statisticians use when talking of dependent tests? Explain 

The term that is used is “paired-sample.” A paired sample is used when each subject is tested twice and it results in paired observations. It also determines whether the difference mean between both sets is equal to zero. It also is measured between both sets to determine whether they are both equal.  

Identify which of the following is the formulas are used for calculating a tvalue for an independent samples and a dependent samples test?  

Independent samples test Dependent samples test
Problems: 

Rob has developed a new drug that he believes can cure Zombieism and stop the Zombie apocalypse. To test his new drug he captures 30 Zombies and randomly separates them into two groups. One group receives his new drug the other a placebo. 

What type of t-test would you use to see if the new drug had a significant effect?  

The independent samples t-test that compares the means of two groups 

What are the statistical hypotheses for this hypothesis (He wants to see a reduction in Zombieism)? 

H0:  (there is no significant difference in the means of the two groups)
H1:  (there is significant difference in the means of two groups) 

Given the following data compute the t-test.

Drug No Drug
Mean: 28 45
s2: 25 48
n: 15 15
s: 5 6.93 
t-test statistics,  ,  

What are the degrees of freedom for problem 1? 

Degrees of freedom, df =  = 15 + 15 – 2 = 28 

What is the critical value to test problem one’s hypothesis? 

Critical value,  = t (28), p < 0.05 = 2.0484 The critical values = (-2.0484, 2.0484)  What can you conclude about Dr. Rob's drug to cure Zombieism?  Since test statistics, t = -7.7059 < -2.0484, the critical value, thus Reject Ho. Therefore, there is sufficient evidence to conclude that there is significant difference in the means of the two groups. Conclusively, Dr. Rob's drug seems to be effective.  Penny, a third grade teacher, has just returned from a teaching conference where she learned about a new teaching method that is predicted to increase retention of new information dramatically. Penny decides to test to see if the new teaching method she learned works. To test the new teaching method Penny teaches using the old method for a week and then gives a test for retention and then teaches using the new method the following week and gives a retention test. There are 10 students in her class. Penny is not sure if the new method will help or hinder her students. What type of t-test would you use to see if the new teaching style had a significant effect?  We use the dependent-samples (paired-samples) t test, which is used to compare the same sample tested under different conditions.  What are the statistical hypotheses for this hypothesis (He wants to see a teaching style improves retention of new information)? H0:    (there is no significant difference between the mean of the old method and the mean of new method)  H1:  (the mean of the new method is higher than the mean of the old method)  Given the following data compute the t-test. Old Method New Method D D2 30 42 12 144 26 29  3     9 33 17 -16  256 31 26 -5 25 35 35  0  0 21 31 10 100 25 22 -3  9 37 40 3  9 16 18 2  4 24 27                                 3                         9        . ∑X1 = 278 ∑X2 = 287 ∑D = 9              ∑D2 = 565  Mean of the difference score = = 0.9 Variance of the difference score =   Standard Deviation = √61.878 = 7.866 = 1.144  What are the degrees of freedom for problem 2?  The degree of freedom, df = n -1 = 10 -1 = 9  What is the critical value to test problem ones hypothesis?  This is one tailed test, therefore the critical value, t (9), p = 0.05 = 1.833  What can you conclude about the effectiveness of Penny's new style of teaching?  The test statistic, t = 1.144 < 1.833, the critical value, thus We do not reject Ho. There is sufficient evidence to support that, on average, the new teaching style had no significant effect on the retention of information with students.    Free Membership to World's Largest Sample Bank To View this & another 50000+ free samples. Please put your valid email id. E-mail Yes, alert me for offers and important updates Submit  Download Sample Now Earn back the money you have spent on the downloaded sample by uploading a unique assignment/study material/research material you have. After we assess the authenticity of the uploaded content, you will get 100% money back in your wallet within 7 days. UploadUnique Document DocumentUnder Evaluation Get Moneyinto Your Wallet Total 4 pages PAY 2 USD TO DOWNLOAD *The content must not be available online or in our existing Database to qualify as unique. Cite This Work To export a reference to this article please select a referencing stye below: APA MLA Harvard OSCOLA Vancouver My Assignment Help. (2020). Null Hypothesis And The Research Hypothesis. Retrieved from https://myassignmenthelp.com/free-samples/psyc-2525-null-hypothesis-and-the-research-hypothesis/independent-samples.html. "Null Hypothesis And The Research Hypothesis." My Assignment Help, 2020, https://myassignmenthelp.com/free-samples/psyc-2525-null-hypothesis-and-the-research-hypothesis/independent-samples.html. My Assignment Help (2020) Null Hypothesis And The Research Hypothesis [Online]. Available from: https://myassignmenthelp.com/free-samples/psyc-2525-null-hypothesis-and-the-research-hypothesis/independent-samples.html[Accessed 18 December 2021]. My Assignment Help. 'Null Hypothesis And The Research Hypothesis' (My Assignment Help, 2020) accessed 18 December 2021.

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