A study determined that in 2009, 38 of those in a random sample of 100 adult Americans had accounts with some type of social web site. In a similar survey conducted in 2012, 53 reported having accounts. Suppose that the 2012 figure was also based on a random sample of size 100. The 95 confidence interval for the difference in population proportions, , is: <--EndFragment--> >
1.0.15 0.088
2.0.29 0.136
3.0.15 0.136
4.0.29 0.88
5.0.00 0.136
Question 2
A study by the Poultry Research Center seeks to determine if diet affects the onset of egg laying in juvenile Rhode Island Red hens. In a group of 34 hens that were fed scratch grain, 12 were laying eggs at 13 weeks of age. In a second, independent group of 25 hens that were fed on layer pellets, 4 hens were laying at 13 weeks of age. The 95 confidence interval for the difference in laying proportions at 13 weeks is:
1.0.19 0.13
2.0 0.13
3.8 10
4.0.16 0.06
5.0.19 0.22
The small-scale distribution of different tree species in a Douglas-fir forest is determined by both
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