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1.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. 2.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. 3.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. 4.Compare and contrast probability and non-probability sampling. What are the advantages and disadvantages of each? Length: 5-7 pages not including title page and reference page. References: include at least 3-5 resources.
Of those mountain climbers who attempt Mt. McKinley, only 65% reach the summit.In a random sample of 16 mountain climbers who are going to attempt Mt. McKinley, what is the probability of each of the following?
A law student, who want to check a professor's claim that convicted embezzlers spend on average 12.3 months in jail, takes a random sample of 36 such cases from court files.
BDI was r =.67. Evaluate this correlation. What does this correlation tell us about the relationship between these two instruments?
At the 0.01 significance level, can we conclude that the mean number of patients per day is more than 25? Estimate the p-value and interpret it.
The manufacturer of the X-15 steel-belted radial truck tire claims that the mean mileage the tire can be driven before the tread wears out is 60,000 miles. The standard deviation of the mileage is 5,000 miles.
Compute the length-of-life value for which 10% of the watch's batteries last longer.
Among those taking the Graduate Record Exam, 18 people are randomly selected.
Welcome a woman taking the initiative in asking for a date. What is the probability that seven (7) of the men say NO.
A sample of 12 homes sold last week in St Paul, Minnesota, is selected. The results are shown below and create a scatterplot. Insert the trendline into the graph and show the regression equation.
Create a 95% confidence interval for population proportion of positive drug tests.
The number of T.V. homes in the sample having cable T.V. What is the probability that at least 2 T.V. homes in the sample are served by cable?
Variance hour 100 and battery y: sample size 12,mean hour 1020,variance hour 121. can you conclude that two types of batteries are having the same mean life?
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