Alan wants to estimate the proportion of adults who walk to work. In a survey of 10 adults, he ﬁnds 0 who walk to work. Explain why a 95% conﬁdence interval using the normal model yields silly results. Then compute and interpret a 95% conﬁdence interval for the proportion of adults who walk to work using Agresti and Coull’s method.
Answer to relevant QuestionsThe American Society for Microbiology (ASM) and the Soap and Detergent Association (SDA) jointly commissioned two separate studies during 2007, both of which were conducted by Harris Interactive. In one of the studies,1001 ...(a) Find the t-value such that the area in the right tail is 0.02 with 19 degrees of freedom. (b) Find the t-value such that the area in the right tail is 0.10 with 32 degrees of freedom. (c) Find thet-value such that the ...A simple random sample of size n is drawn. The sample mean, x, is found to be 18.4, and the sample standard deviation,s, is found to be 4.5. (a) Construct a 95% conﬁdence interval for µ if the sample size, n, is 35. (b) ...Tensile strength is the amount of stress a material can withstand before it breaks. Researchers wanted to determine the tensile strength of a resin cement used in bonding crowns to teeth. The researchers bonded crowns to 72 ...A question on the 2006 General Social Survey was this: “About how many times did you engage in intercourse during the month?” The question was only asked of participants who had previously indicated that they had engaged ...
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