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"An Analysis of the Study Time-Grade Association," published in Radical Pedagogy in 2002, reported scores on a standardized test for cognitive ability for subgroups of students in an Introductory Psychology course, classified according to how much they studied for the course per week. Standard deviation was 7.74 for scores of students who studied zero hours per week, and 2.82 for scores of students who studied nine or more hours per week.12 What does this suggest about performances of students? Choose one of these:
a. Students who don't study have a higher cognitive ability.
b. Students who don't study have a lower cognitive ability.
c. Students who don't study are more predictable in terms of their cognitive ability.
d. Students who don't study are less predictable in terms of their cognitive ability.
Is there conclusive evidence that one of the proportions is significantly different from the other? Explain using the results of part a. Do not perform any test
A game involving a pair of dice pays out $4 with probability 16/36, costs you $2 with probability 14/36, and costs you $6 with probability 6/36.
The distribution of bladder volume in women is approximately N(400,75) in milliliters. Find the proportion of women's bladders with a volume between 500 and 600m.
Named let'' is a variant of let that has the form he and are just as in ordinary let, except that is bound within to a procedure whose body is and whose parameters are the variables in the. Thus, one can repeatedly execute the by invoking ..
the number of hybrid cars that have be requested for rental from a car rental office during a 50 day sample period is
The representative received 40 percent of the popular vote in that area of the state. She doubts whether it has changed much. How many registered voters should be sampled?
Given that a Brand A battery just failed, what is the expected value of the time we wait until the next Brand B failure?"
What proportion of the patients do you expect to be obese, assuming normality? Find the Cp index and establish a 95% lower confidence interval.
Does using statistical software improve exam scores? An instructor in an elementary statistics course wants to know if using a new statistical software package
list the measures of center from the least affected by outliers to the most affected by
In 1990, the average math SAT score for students at one school was 500. Five years later, a teacher wants to perform a hypothesis test to determine
Consider a nonsymmetric random walk onZ, where we start at the origin, and at each time step we either move right one unit with probabilityp >1/2 or left.
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