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Question: Chocolate and happy babies A University of Helsinki (Finland) study wanted to determine if chocolate consumption during pregnancy had an effect on infant temperament at age 6 months. Researchers began by asking 305 healthy pregnant women to report their chocolate consumption. Six months after birth, the researchers asked mothers to rate their infants' temperament, including smiling, laughter, and fear. The babies born to women who had been eating chocolate daily during pregnancy were found to be more active and "positively reactive"-a measure that the investigators said encompasses traits like smiling and laughter.
(a) Was this an observational study or an experiment? Justify your answer.
(b) What are the explanatory and response variables?
(c) Does this study show that eating chocolate regularly during pregnancy helps produce infants with good temperament? Explain.
Federal Reserve Board regulations permit banks to offer their clients commercial paper. - Can you conclude that Bank of America has a greater share of the new market for commercial paper? Explain.
What statistical procedure was used to analyze data in study B?
Is there any evidence to suggest the true proportion of assisted-living patients who are satisfied is less than 0.92? Use a = 0.01.
a large study was conducted to test the effectiveness of a drug in combination with aspirin in warding off heart
What is the slope of the least-squares (best-fit) line? Interpret the slope
Choosing the appropriate the sampling design for the given data
Seven employees were included from Area A, 9 from Area B and 12 from Area C. The test statistic was computed to be 4.91. What can we conclude at the 0.05 level?
A large plumbing contractor buys eight 200-foot rolls from the producer described in given Exercise. Determine the probability that no more than three of the eight rolls will be flawless.
the project requires you to use the statistical techniques learned in this class. you may make up data as you like
For a lottery to be successful, the public must have con dence in its fairness. One of the lotteries in Maryland is Pick-3 Lottery. Write down the test statistic to be used for testing the hypothesis.
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Whenever its service life ends, the tank is intended to be sold to a steel mill as metal scrap for $3000. Using 10% interest rate: Find the capitalized cost of the storage tank investment.
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