Hypothesis Testing Psychological Assessment (Mar 1995) published the results of a study of World WarIl aviators who were captured by German forces after they were shot down. Havinglocated a total of 239 WWII aviator POW survivors, the researchers asked eachveteran to participate in the study; 33 responded to the letter of invitation. Each ofthe 33 POW survivors was administered the Minnesota Multiphasic PersonalityInventory, one component of which measures level of post-traumatic stress dlisorder or(PTSD). [Note: the higher the score, the higher the level of PTSD.] The aviatorsproduced a mean PTSD score of 9.00 and a standard deviation of 9.32.A. Set up the null and alternative hypotheses for determining whether the true meanPTSD score of all wWIl aviator POWS is less than 16. [Note: the value, 16,represents the mean PTSD score established for Vietnam POWW.)B. Conduct the test, in A, using 10% level of significance. What are the practicalimplications of the test?

A one sample t - test is used to test whether the true mean of a population group is differ from…

Answered: Hypothesis Testing

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section: Chapter Questions

Problem 8CR

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What is meant by the sample space of an experiment?
Researchers compared the effectiveness of a mood induction technique (exposure to depressing film footage) across 3 different groups of 11 participants each: 1) 0 minutes exposure (Control Group), 2) 10 minutes exposure, & 3) 20 minutes exposure. The response variable is the score on the Beck Depression Inventory (higher score = more depressed mood). M1 = 7 M2 = 11 M3 = 12 SS1 = 56 SS2 = 96 SS3 = 62 n1 = 11 n2 = 11 n3 = 11 SSTOTAL = 368
To determine a target audience for a new email package, a computer company surveyed a large random sample of potential customers, asking each whether he/she uses email on a regular basis. (The company considered "a regular basis" to be at least three times a week.) The data, as summarized in the contingency table below, were classified according to two variables: the age of the respondent ("under 18", "18-35", "36-54", "55+") and regularity of email use ("on a regular basis" or "not on a regular basis"). Each cell of the table contains three numbers: the first number is the observed cell frequency (fO); the second number is the expected cell frequency (fE) under the assumption that there is no dependence between age and regularity of email use and the third number is the following value.
To determine a target audience for a new email package, a computer company surveyed a large random sample of potential customers, asking each whether he/she uses email on a regular basis. (The company considered "a regular basis" to be at least three times a week.) The data, as summarized in the contingency table below, were classified according to two variables: the age of the respondent ("under 18", "18-35", "36-54", "55+") and regularity of email use ("on a regular basis" or "not on a regular basis"). Each cell of the table contains three numbers: the first number is the observed cell frequency (fO); the second number is the expected cell frequency (fE) under the assumption that there is no dependence between age and regularity of email use and the third number is the following value. =−fOfE2fE−Observed cell frequencyExpected cell frequency2Expected cell frequency
In a study examining the effect of humor on interpersonal attractions, McGee and Shevlin (2009) found that a man’s sense of humor had a significant effect on how he was perceived by women. In the study, female college students were given brief descriptions of a potential romantic partner and then rated the attractiveness of the male on a scale from 1 (low) to 7 (high). The fictitious male was described positively as being single, ambitious, and having good job prospects. In one condition, the description also said that he had a great sense of humor. The results showed that the description was rated significantly higher when “a sense of humor” was included. To examine this effect further, a researcher selected a sample of n = 16 college males and asked them to read a brief description of a female and then rate the attractiveness of the woman in the description. The description had been used in previous research but was modified by adding a statement describing a good sense of humor.…
Researchers compared the effectiveness of a mood induction technique (exposure to depressing film footage) across 3 different groups of 11 participants each: 1) 0 minutes exposure (Control Group), 2) 10 minutes exposure, & 3) 20 minutes exposure. The response variable is the score on the Beck Depression Inventory (higher score = more depressed mood). M1 = 7 M2 = 11 M3 = 12 SS1 = 56 SS2 = 96 SS3 = 62 n1 = 11 n2 = 11 n3 = 11 SSTOTAL = 368 State whether the results warrant additional analysis (post hoc analyses). Explain why or why not, and explain why such analyses would be needed.
In a study examining the effect of humor on interpersonal attractions, McGee and Shevlin (2009) foundthat a man’s sense of humor had a significant effect onhow he was perceived by women. In the study, femalecollege students were given brief descriptions of a potential romantic partner and then rated the attractivenessof the male on a scale from 1 (low) to 7 (high). Thefictitious male was described positively as being single,ambitious, and having good job prospects. In one condition, the description also said that he had a great senseof humor. The results showed that the description wasrated significantly higher when “a sense of humor” wasincluded. To further examine this effect, a researcherselected a sample of n = 16 college males and askedthem to read a brief description of a female and thenrate the attractiveness of the woman in the description.The description had been used in previous research butwas modified by adding a statement describing a goodsense of humor. Based on the…
In a study of three nationally representative large- scale data sets from Ireland, the United States, and the United Kingdom (n = 17,247), teenagers between the ages of 12 to 15 were asked to keep a diary of their screen time and answer questions about how they felt or acted. Identify the explanatory variables. Comment on wheter the results of the study can be generalized to the population and why
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