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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 sample of 10 electronic tubes produced by a company showed a mean lifetime of 1200 hours and a standard deviation of 100 hours. estimate the mean and the standard deviation of the population of all such tubes produced by the company?
International Agricultural Producers publishes annual data on various selected farm products. Shown above are the unit productions figures (in millions of bushels) for three farm products for 10 years.
How many cans of paint should the sample contain if the researcher wants to be 98% certain of being within one percentage point of the true proportion of this chemical?
Imagine if you were researching sales techniques directed at vulnerable or unaware populations with regard to the sale or promotion of new pop alcohol drinks that emphasized the pop ignoring the alcohol, or of products and magazines relating to de..
a pysics lab instructor wants to estimate the time required for physic students to complete a required experiment. from
The "greasers" are working in te pits guarantee that the oil change will take no longer than 20 minutes. If it takes longer that that, a customer will only have to pay half-fare. What is the approximate percentage of customers that can expect to p..
A sample of 50 provided a sample mean of 14.15. The population standard deviation is 3.
find the p-value obtained when testing the claim that p 0.75 when given sample data resulting in a test statistic of z
Linear programming problems. Computethe following linear programming problem. Among which of the following points (X,Y) is feasible.
confidence interval for the population mean.a sample of 49 items in a grocery store has an average fat content of 18.6
For the k user CDMA system employing LMSE receivers in Problem 9.4.7, it is still necessary for a receiver to make decisions on what bits were transmitted. Based on the LMSE estimate , the bit decision rule for user i is = sgn ( ) Following the ..
How many months had no days with 0.5 inches or more of precipitation? What proportion of months had no days with 0.5 inches or more of precipitation? Construct a 95% confidence interval for the proportion of months that had no days with 0.5 inches..
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