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The article "Television's Value to Kids: It's All in How They Use It" (Seattle Times, July 6, 2005) described a study in which researchers analyzed standardized test results and television viewing habits of 1700 children. They found that children who averaged more than two hours of television viewing per day when they were younger than 3 tended to score lower on measures of reading ability and short term memory.
a. Is the study described an observational study or an experiment?
b. Is it reasonable to conclude that watching two or more hours of television is the cause of lower reading scores? Explain.
Give a brief definition and an example of the following: a. Descriptive Statistics b. Inferential Statistics
1. A company uses three different assembly lines A1, A2, and A3 to manufacture a particular component. Of those manufactured by line A1, 5% need re- work to remedy a defect, whereas 8% of A2 s components need rework and 10% of A3 s need re- work. Sup..
After 1,000-trial simulation, examine statistical information generated and compare output of simulation with your findings in Problem .Briefly describe the significant similarities and differences.
Use a two-factor ANOVA to analyze these data and interpret your results. The data are not currently set up correctly for doing a two-factor ANOVA in Excel, so you will likely need to rearrange them
Standardized scores offers a way of comparing norm-referenced scores. The z-score distribution is based on knowing how many standard deviations away from the mean a certain score is.
a biometric security device using fingerprints erroneously refuses to admit 3 in 2000 authorized persons from a
What is coefficient of dispersion? What purpose does it serve? Prove that the some of the squared deviations is least when taken from the mean.
bags of a certain brand of tortilla chips claim to have a net weight of 16 ounces. net weights actually vary slightly
This means that you may refer to your textbook, notes, and online course materials, but you must work independently and may not consult anyone.
Q. An owner of a chain of stores would like to predict weekly sales based on the number of customers who made a purchase. A random sample of 10 stores were selected. The weekly sales are in thousands of dollars.
test the hypothesis using the classical approach and the p-value approach.ho p 0.45 versus hi p lt 0.45n 150 x 62 a
Solve the problem: According to police sources a car with a certain protection system will be recovered 94% of the time. Find the probability that 4 of 8 stolen cars will be recovered.
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