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Test the significant difference between chi-square for attributes.
Are teens' attitudes toward trying cocaine dependent on their GPA? Using data from the MTF 2006, test whether attitude toward trying cocaine is independent of high school GPA (∝ = 0.01). How is this relationship different from the bi-variate relationships?
Attitude Toward
GPA
Trying Cocaine
2.0 or less
3.0
4.0
Total
Don't disapprove
24
30
15
69
Disapprove
28
31
27
86
Strongly disapprove
82
187
182
451
134
248
224
606
Assume that a hand of 12 cards is dealt from a normal deck of 52 playing cards. What is the probability that of the 12 cards, 3 will be diamonds, 3 will be clubs, 3 will be spades, and 3 will be hearts.
Calculate the correlation coefficient. What is the coefficient of determination from these sample statistics? What does this coefficient indicate?
Estimate with 90% confidence the difference in the level of satisfaction with service between the two branches.
Research question: Are mean crash damages same for these 3 vehicles? Crash1 Crash Damage ($).
A normal distribution with a mean of 55 and a standard deviation of 6 is evaluated to solve a business problem.
what size sample should the director choose if she wishes to estimate the mean number of admissions per 24-hour period to within 1 admission with 99 percent reliability.
How many dissimilar computer passwords are possible?
An educational study uses a simple pre-post design to assess the efficacy of a computer tutor for solving inequalities. Twelve pilot students participate. Each student is given a pre-test, then participates in six sessions using the tutor, then i..
Now compute the standard deviation for this distribution.
Another day, it took Eric only 12 minutes to get to work. Using the same formula, determine the z value. Is it positive or negative? Explain why it should be positive or negative.
Consider the following estimated regression equation, based on 10 observations.
Suppose the likelihood that any flight on Northwest Airlines arrives within 15 minutes of scheduled time is .90. We choose four flights from yesterday for study.
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