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1. Statistical Literacy: a study used the variables: income, job satisfaction, and commute to and from work. How or why could the included variables be confounded? List at least one non-collected variable that could confound all variables.
2. Statistical Literacy: In a completely randomized study a control group received a candy pill disguised as a decongestant and a treatment group received a newly developed decongestant. Describe how this could be made into a double-blinded experiment and the benefits of such experiment.
3. Critical Thinking: An environmental scientist deployed a very well-designed survey at a farmer's market to capture city residents' opinions about recycling; she explained participants that their responses might be used to change the city's garbage collection policies. She stood in front of respondents in a position where they could see her t-shirt reading 'fight climate change'. Do respondents represent a random sample of the city's residents? Would you be concerned that in spite of a well-designed survey, the scientist may introduce bias into respondents' responses? Justify each answer.
What is the probability that a randomly selected monthly cell phone bill is more than $100?
Locate the results of a recent survey in a newspaper, magazine, or Internet article. Outline the survey data so that your peers can understand the variables and results, and then identify at least one key formula from this Module that you could us..
list the steps at neuromuscular junction leading to opening of voltage gated channels nearby?
Problem 1: The employees have indicated that 95% of employees in one of the departments are receiving higher salaries than any other department because their supervisor parties with them each weekend. Some employees only have an hourly rate which..
Consider a binomial experiment with n = 8 trials where the probability of success on a single trial is p = 0.25. (For each answer, enter a number.
Henry goes to a hardware store. He considers a power drill at $35, a socket wrench set at $56, a set of screwdrivers at $18, a vise at $24, and hammer at $8.
At a local technical school, five auto repair (out of a total of 20) classes are randomly selected and all of the students from each class are interviewed.
Modify the spreadsheet model, and use OptQuest to find a solution that maximizes the mean return.
Explain why researchers do not use random samples. How are they able to generalize their results?
Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 90% confidence that the sample mean is within 8 IQ points of the true mean.
Consider some decision-making situations in any aspect of Hospital Administration, and describe two or more population variances are important.
This result applies no matter what the shape of the probability distribution from which the samples are taken. Central Limit Theorem: How Large a Sample?
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