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In 2007 a Pew survey asked 1447 Internet users about their sources of news and information about science. Among those who had broadband access at home, 34% said they would turn to the Internet for most of their science news.
The report on this survey claims that this is not significantly different from the percentage (33%) who said they ordinarily get their science news from television. What does it mean to say that the difference is not significant?
A nursing school wants to estimate the true mean annual income of its alumni. It randomly samples 120 of its alumni. The mean annual income was $58,700 with a standard deviation of $1,500.
The president of a university claims that the mean time spent parting by all students at this university is not more than 7 hours per week. A random sample of 25 students taken from this university showed that they spent an average of 9.50 hours p..
1. What is the difference between a histogram and a bar chart? For what type of data would each be appropriate? 2. The following U.S. market shares for 2007 retail car sales have been reported. Source: World Almanac and Book of Facts 2009, p. 122.
For each of the studies described, explain whether the study was an observational study or a randomized experiment.
Prepare a 2 slide Microsoft PowerPoint Presentation with speaker notes, how to use a z-test to test the null hypothesis and give an example of z-test to test the null hypothesis
At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. If you determine not to reject the null hypothesi..
Explain what the coefficient of determination, R^2 (R-squared), measures. How is it related to the sample correlation coefficient?
assignment questionsquestion 1a the following data represent the number of years patients survived after being
Find a 90% confidence interval for the population average µ of the percentage of hospitals providing at least some charity care.
4. Here is an alternative procedural representation of pairs. For this representation, verify that (car (cons x y)) yields x for any objects x and y.
The number of newspapers demanded daily in a large metropolitan area is believed to be an approximately normally distributed random variable. If more newspapers are demanded than are printed, the paper suffers an opportunity loss, in that it could..
To determine whether this difference is significant, you collect data on the workout preferences for a sample of men and women at your gym.
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