Why confidence intervals wider are when we use larger confidence levels but narrower when we use larger sample sizes, other things being equal?
Answer to relevant QuestionsTo use the large sample confidence interval for p, you need at least 15 successes and 15 failures. Show that the smallest value of n for which the method can be used is (a) 30 when p̂ = 0.50. b) 50 when p̂ = 0.30. (c) 150 ...In 1994 (the most recent year asked), the General Social Survey asked, “During the last year, did anyone take something from you by using force—such as a stickup, mugging, or threat?” Of 1223 subjects, 31 answered yes ...In the 2008 General Social Survey, respondents were asked if they favored or opposed the death penalty for people convicted of murder. Software shows results Here, X refers to the number of the respondents who were in ...Using the Confidence Interval for a Proportion applet on the text CD, let’s check that the large-sample confidence interval for a proportion may work poorly with small samples. Set n = 10 and p = 0.10. Generate 100 random ...According to a union agreement, the mean income for all senior-level assembly-line workers in a large company equals $500 per week. A representative of a women’s group decides to analyze whether the mean income for female ...
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