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9 steps of the scientific method
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Flashcards
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Test
Match
Terms in this set (9)
1)
Observe a phenomenon
2)
Ask a question/ start inferring
3)
Form a hypothesis
4)
Create an experiment
5)
Collect data
6)
Compare results
7)
Analyze
8)
Report findings
9)
Compare with other experiments
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Verified questions
STATISTICS
Let p(y) denote the probability function associated with a Poisson random variable with mean $$ \lambda $$ . For which values of y is p(y) > p(y − 1)?
STATISTICS
A social worker wants to examine methods that can be used to deter truancy. Three hundred chronically truant students volunteer for the study. Because the social worker believes that socioeconomic class plays a role in truancy, she divides the 300 volunteers according to household income. Of the 300 students, 120 fall in the low-income category, 132 fall in the middle-income category, and the remaining 48 fall in the upper-income category. The students within each income category are randomly divided into three groups. Students in group 1 receive no intervention. Students in group 2 are treat ed with positive reinforcement in which, for each day the student is not truant, he or she receives a star that can be traded in for rewards. Students in group 3 are treated with negative reinforcement such that each truancy results in a 1-hour detention. However, the hours of detention are cumulative, meaning that the first truancy results in 1 hour of detention, the second truancy results in 2 hours, and so on. After a full school year, the total number of truancies are compared. (a) What type of experimental design is this? (b) What is the response variable in this experiment? (c) What are the treatments? (d) What variable serves as the block? (e) Draw a diagram to illustrate the design.
PROBABILITY
Decide whether a discrete or continuous random variable is the best model for each of the following variables. The lifetime of a biomedical device after implant in a patient.
STATISTICS
Telephone pollsters often interview between 1000 and 1500 individuals regarding their opinions on various issues. Does the performance of colleges’ athletic teams have a positive impact on the public’s perception of the prestige of the institutions? A new survey is to be undertaken to see if there is a difference between the opinions of men and women on this issue. Suppose that you were designing the survey and wished to estimate the difference in a pair of proportions, correct to within .02, with probability .9. How many interviewees should be included in each sample?
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