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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?
Please discuss an application of ANOVA that might be undertaken in a workplace. What are the 3 or more treatments? What is the response variable?
Professor Cox needs a volunteer amongst 30 students in his statistical applications course. The average age of his students is 25 years, with the standard deviation of 3 years.
The null hypotheseis it true? Sketch the density curve of the sampling distribution. Be sure to locate mean and standard deviationn correctly.
A random sample of 20 single men were asked if they would welcome a woman taking the initiative in asking for a date. What is the probability that at least 18 of the men will say yes.
You will actually have negative sales using this multiple regression analysis
Find each value requested for the distribution of scores in following table. For the following scores the lowest value is x=13 place the scores in a frequency distribution table using.
If the agent has enough time to contact only 15 customers, how confident can she be of selling all four houses within the available time?
Do men and women have different beliefs on the ideal number of children in a family? Based on the following GSS2008 Data and the obtained t statistics, what would you conclude?
Find the percentage of buyers who said their price range is between $150,000 and $153,300.
(a) Consider a normal distribution with mean μ = 88. If 2% of the values lie below x = 50, find the standard deviation σ. (b) Consider a normal distribution with standard deviation σ = 15.6. If 10% of the values lie above x = 17.2, find the mean μ.
Is contamination with the two kinds of bacteria disjoint? Explain. (c) Is contamination with the two kinds of bacteria independent? Explain.
Think of your favorite casino game (craps, black-jack, roulette, etc) and analyze the probabilities of a few different outcomes.
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