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
Figure 7.1 shows the rapid decline in the trust of Americans in government since the 1960s. This de
A family of African Americans arrive in Chicago, migrants from the American South, in an exodus that
Mary Cassatt, Study for In the Loge.
Review in Changes in Eight Different Domains of Adult Functioning
Performing a Correlational Study
A 230.0-mL sample of a 0.275 M solution is left on a hot plate overnight; the following morning ...