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Compare and contrast internal and external validity. Describe and give examples of research questions for which external validity is a primary concern. Describe and give examples of research questions in which internal validity is a primary concern. Discuss strategies researchers use in order to make strong claims about the applicability of their findings to a target population.
Compare and contrast random selection and random assignment. Be sure to include a discussion of when you would want to do one or the other and the possible consequences of failing to do random selection or random assignment in particular situations.
Explain the relationship between sample size and the likelihood of a statistically significant difference between measured values of two groups. In other words, explain why, all else being equal, as sample size increases the likelihood of finding a statistically significant relationship increases.
Compare and contrast probability and non-probability sampling. What are the advantages and disadvantages of each?
How many relations on A are both symmetric and antisymmetric?
What is the chi squared statistic for the given information?
Run a regression analysis using the BENEFITS column of all data points in the AIU data set as the independent variable and the INTRINSIC job satisfaction column of all data points in the AIU data set as the dependent variable.
A normal resting heart rate for adults ranges from 60 to 100 beats a minute," reports Dr. Edward Laskowski of the Mayo Clinic. Lower resting heart rates are generally associated with higher cardiovascular fitness.
A random child is chosen in the town (with equal probabilities). Find the PMF, mean, and variance of the child's birth rank.
Question 3: The null hypothesis for the test of independence states that no correlation exists between the variables.
Find an article in a professional journal that uses the tools of numerical measurement we focused on in these chapters. Write a brief report describing the impact of these tools and how they were effective or ineffective in illustrating the resear..
The correlation between number of friends and grade point average (GPA) for 50 adolescents is .37. Is this significant at the .05 level for a two-tailed test?
Is there a correlation between x and y in Problem 1? Use Table A-5 to help you to explain your answer. Don't just say yes or no! Find the equation of the regression line for the data in Problem 1. Round your slope and y-intercept to three decimal..
What is the probability that my right headlight will last for at least 1900 hours given that it has not failed after 950 hours?
Analyze the data with MegaStat®, StatCrunch®, Microsoft® Excel®or other statistical tool(s), including: Descriptive stats for each numeric variable
Define a linear map T from the vector space C to the vector space and matrix multiplication and with the identity matrix
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