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Developers of a new math curriculum called Accelerated Math compared performances of students taught by their system with control groups of students in the same schools who were taught using traditional instructional methods and materials. Statistics about pretest and posttest scores are shown in the table. (J. Ysseldyke and S. Tardrew, Differentiating Math Instruction, Renaissance Learning, 2002)
a) Did the groups differ in average math score at the start of this study?
b) Did the group taught using the Accelerated Math program show a significant improvement in test scores?
c) Did the control group show a significant improvement in test scores?
d) Were gains significantly higher for the Accelerated Math group than for the control group?
Find out the test statistic s and its two-sided P -value. Do data give good evidence that population mean is not zero?
the comfort widget company makes severtal different widgets. the smallest widget the company manufactures has a mean
Refer to the Journal of Information Science study of the relationship between the fraction y of documents retrieved using Medline and the number x of terms in the search query, Exercise 9.39. (p. 502)
Find a 95% confidence interval for the mean of all drinks dispensed by this machine if a random sample of 36 drinks has an average content of 2.25 deciliters.
(a) Find the lower and upper quartiles, median, and interquartile range. Check for any outliers and interpret. (b) Construct a box plot and interpret. (c) Are there any outliers?
The industry standard suggests that 10% of new vehicles require warranty service within the first year. Jones Nissan in Sumter, South California, sold 12 Nissans yesterday. What is the probability that none of these vehicles require warranty servic..
Help with showing how do detrime the standard deviation of a problem when the standard deviation is 5. An example would help me to work out a problem for the normal probability distribution.
Under what conditions is it appropriate to use the normal approximation to the binomial distribution in constructing the confidence interval for the population proportion?
chocolate-coated sugar fun blast cereal is filled in boxes by weight. the weight of the boxes is approximately normally
a rare disease occurs in about 1 out of 1000 people who are similar to you. a test for the disease has sensitivity of
assume that a simple random sample has been selected from a normally distribution population and test the given claim.
On the basis of these results, do you think retailers and consumers have a right to complain to the manufacturers? Why?
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