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One of the major misconceptions about correlation is that a relationship between two variables means causation; that is, one variable causes changes in the other variable. There is a particular tendency to make this causal error, when the two variables seem to be related to each other.
What is one instance where you have seen correlation misinterpreted as causation? Please describe.
Four percent of DVD players manufactured by an electronics company are defective. Suppose six DVD players are randomly selected from the production line.
a) What percent of all costs and expenses were cost of revenues in 2005? In 2006? b) What percent of all costs and expenses were due to re- search and development in 2005? In 2006? c) Have general administrative costs grown as a percentage of all cos..
If a random sample of 21 is taken, what is the probability that the sample of kindergarten children has a mean height of less than 39.4 inches? (Give your answer correct to four decimal places)
What is the? 95% confidence interval for the proportion of all Americans that watch 60? Minutes?
The presenter uses the "flip of the coin" and the "role of the die." These are examples and analogies used in the CTU resources.
Random Assignment of Professors A study randomly assigned students attending the Air Force Academy to different professors for Calculus I.
When the data on at least one variable are ordinal, the data on any scale variable must be converted from scale to ordinal. How do we convert a scale variable into an ordinal one?
Describe how you would educate personnel about the importance of handwashing and increase handwashing compliance amongst the staff?
to assess the opinion of students at the ohio state university about campus safety a reporter for the student
Take me out to the ball game. What is the relationship between the price charged for a hot dog and the price charged for a 16-ounce soda in Major League.
Assume that a sample is used to estimate a population proportion p. Find the 95% confidence interval for a sample of size 296 with 219 successes.
A medical school claims that more than 28% of its students plan to go into general practice. It is found that among a random sample of 130 of the school's students, 32% of them plan to go into general practice. Find the P-value for a test of the s..
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