Chapter%201%20homework

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Bowie State University *

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101

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Psychology

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May 7, 2024

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pdf

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4

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1. A teacher wishes to know whether the males in his/her class have more conservative attitudes than the females. A questionnaire is distributed assessing attitudes and the males and the females are compared. Is this an example of descriptive or inferential statistics? ( relevant section 1 , relevant section 2 ) Inferential statistics 2. A cognitive psychologist is interested in comparing two ways of presenting stimuli on subsequent memory. Twelve subjects are presented with each method and a memory test is given. What would be the roles of descriptive and inferential statistics in the analysis of these data? ( relevant section 1 & relevant section 2 ) The descriptive would give a wordy summary of all the twelve subjects that used each method. While the inferential statistics will give results concluded by the 12 subjects 3. If you are told that you scored in the 80th percentile, from just this information would you know exactly what that means and how it was calculated? Explain. ( relevant section ) This means that I scored higher then a good majority but since I don’t know the amount of people I scored out of I can’t accurately calculate it 4. A study is conducted to determine whether people learn better with spaced or massed practice. Subjects volunteer from an introductory psychology class. At the beginning of the semester 12 subjects volunteer and are assigned to the massed- practice condition. At the end of the semester 12 subjects volunteer and are assigned to the spaced-practice condition. This experiment involves two kinds of non-random sampling: (1) Subjects are not randomly sampled from some specified population and (2) Subjects are not randomly assigned to conditions. Which of the problems relates to the generality of the results? Which of the problems relates to the validity of the results? Which problem is more serious? ( relevant section ) The non random sampling relates to generality of results since there is no specific population that non random was taken from the results may not be generalizable to the larger population. The non random assignmenting of subject related to the validity of the results 5. Give an example of an independent and a dependent variable. ( relevant section )
The amount of fertilizer given to plant is the independent variable and the dependent variable would be the height of the plants. 6. Categorize the following variables as being qualitative or quantitative: ( relevant section ) Rating of the quality of a movie on a 7- qualitative Age- Quantiive Country you were born in - qualitive Favorite Color- Qualitative Time to respond to a question- Quantitative 7. Specify the level of measurement used for the items in Question 6. ( relevant section ) Rating of the quality of a movie on a 7- ordina l Age- ratio Country you were born in- nominal Favorite Color- nominal Time to respond to a question- interval 8. Which of the following are linear transformations? ( relevant section ) Converting from meters to kilometers - linear Squaring each side to find the area- not linear Converting from ounces to pounds- linear Taking the square root of each person's height.— not linear Multiplying all numbers by 2 and then adding 5- linear Converting temperature from Fahrenheit to Centigrade - linear 9. The formula for finding each student's test grade (g) from his or her raw score (s) on a test is as follows: g = 16 + 3s
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