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Test the given claim - Global warming survey:
A Pew research poll was conducted to investigate opinions about global warming. The respondents who answered yes when asked if there is solid evidence that the earth is getting warmer were then asked to select a cause of global warming. The results for two age brackets are given in the table below. Use a 0.01 significance level to test the claim that the age bracket is independent of the choice for the cause of global warming. Do respondents from both age brackets appear to agree, or is there a substantial difference?
Human activity Natural patterns Don't know
Under 30 108 41 7
65 and over 121 71 43
At 0.05 level of significance, is there evidence of significant relationship between age group and where people mainly get their news? If so, describe the relationship.
Sprinkler Systems. A manufacturer of sprinkler systems designed for fire protection claims that the average activating temperature is at least 135 degrees F.
The letters of the word PRESERVE are arranged at random. Then what is the probability that all the 3 E's occur together??
Is the bottled water you're drinking really purified water? A four year study of bottled water brands conducted by the natural resources found that 25% if bottled water is just tap water. Consider a sample of five bottled water brands, and let x e..
A student must choose one of the subjects, art, geology, or psychology, as an elective. She is equally likely to choose art or psychology and twice as likely to choose geology.
In a recent study 90 percent of the homes in the United States were found to have largescreen TVs. In a sample of nine homes, what is the probability that:
a) 95% of confidence intervals generated will include the sample mean X. b) 5% of the confidence intervals generated will include the true mean μ
If we want to increase our confidence level from 95% to 99%, what happens to our confidence interval?
A random sample of 180 full-grown lobsters had a mean weight of 16 ounces and a standard deviation of 3.0 ounces. Construct a 98 percent confidence interval for the population mean.
What is correlation analysis? How can correlation analysis be used in a business decision or examples specifically related to strategy formulation and implementation?
How many jackets should the store owner order if she wants to maximize her expected profit?
If there is one-year warranty on the equipment, what proportion of the customers will actually make a valid warranty claim?
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