Transcription of Solutions to Homework 3 Statistics 302 Professor Larget
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Solutions to Homework 3 Statistics 302 Professor Larget
Solutions to Homework 3. Statistics 302 Professor Larget Textbook Exercises Customized Home Pages A random sample of n = 1675 Internet users in the US in January 2010 found that 469 of them have customized their web browser's home page to include news from sources and on topics that particularly interest them. State the population and param- eter of interest. Use the information from the sample to give the best estimate of the population parameter. What would we have to do to calculate the value of the parameter exactly? Solution The population is all internet users in the US. The population parameter of interest is p, the propor- tion of internet users who have customized their home page. For this sample, p = 469/1675 = Unless we have additional information, the best point estimate of the population parameter p is p = To find p exactly, we would have to obtain information about the home page of every internet user in the US, which is unrealistic.
that distribution A goes with sample size n = 20, distribution B goes with n = 100, and distribution C goes with n = 500. (b) We see in dotplot A that quite a few of the sample proportions (when n = 20) are less than 0.25 or greater than 0.45, so being o by more than 0.10 would not be too surprising. While it
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