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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.
1.an instructor wanted to construct a confidence interval for the mean gpa of the students in his class. he used the
Determine the sample proportion, p, of successful people. If the population proportion is 0.70, determine the standard error of the proportion.
Question: The cash flow of the project is as follows. Decide if the project is acceptable when the discount rate is 10% Year Cashflow($) 0 -1000000 1 200000 2 200000 3 300000 4 300000 5 350000
Do you think the actual number in the " ≤ 140" range would equal the expected number in this range? If so, why? If not, why not?
Conduct a test for equality of average hotel room prices in these two countries against a two-tailed alternative. Which country has less expensive hotels?
You are picking up apples from a tree in a park. You are interested in estimating the mean weight of all apples in the park. Unfortunately you have only been able to find seven apples so far. Can you use the Central Limit Theorem to aid in your es..
Problem: For a lottery to be successful, the public must have confidence in its fairness. One of the lotteries in a state is a pick-3 lottery, where 3 random digits are drawn each day.
Forty-five percent of the time, sales are above 671,000 copies, and 10% of the time, sales are above 712,000 copies. Find the mean and the variance of annual sales.
If I had 6600 wigets, how many do I have to test with 0 failures to show 95% of them are acceptable with a 95% confidence?
Claims involving automobiles are selected at random. What is the probability that six or more claims (x greater than or equal to 6) will be made by males under 25?
jorge finds that his standardized z score on an iq is 2.0. what percentage of people did he score higher than?a. 98b.
Find a 90% confidence interval for the population mean weight of all such turtles.
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