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Question: Online social networking. The Parents & Teens 2006 Survey of 935 12- to 17-year-olds found that, among teens aged 15-17, girls were significantly more likely to have used social networking sites and online profiles. 70% of the girls surveyed had used an online social network, compared to 54% of the boys. What does it mean to say that the difference in proportions is "significant"?
Draw the distribution of the random variable X, representing her time of arrival. (Be sure to include labels and values on the axes.)
It appears that the median height for sopranos is missing, but actually the median and the upper quartile are equal. How could that happen?
q1. listed below is the net sales in million for home depot inc. and its subsidiaries from 1993 to 2004.yearnet
For a randomly selected group of 30 Maine residents who were of voting age at that time, what is the probability that at least 20 of these persons voted in the presidential election?
Suppose that it is a presidential election year and Ohio is one of the 'swing' states. Your polling company wants to conduct a presidential preference poll of the citizens of Ohio to predict which candidate will win the election.
A particle source A emits one particle at a time, according to a Poisson process with an intensity of two particles a minute. Another particle source B emits two particles at a time, according to a Poisson process with an intensity of one pair of ..
Is the correlation between winning time and year positive or negative? Explain how you know, and explain what that means in the context of this situation.
Will an SRS of size 1785 usually give a result p-hat within plus or minus 3 percentage points of the true population proportion? Explain.
in a test of weight loss programs 198 subjects were divided such that 33 subjects followed each of 6 diets. each was
The average hourly workweek varies from country to country for industrial workers.- What kind of graph is appropriate for these data? Create a graph and execute it.
Use Chebyshev's theorem to find what percent of the values will fall between 120 and 150 for a data set with mean of 135 and standard deviation of 7.5.
Create a 99 percent confidence interval for difference in means between Line B and Line C.
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