A hospital administrator wants to estimate the mean length of stay for all inpatients using that hospital. Using a random sample of 100 records of patients for the previous year, she reports that “The sample mean was 5.3. In repeated random samples of this size, the sample mean could be expected to fall within 1.0 of the true mean about 95% of the time.” Explain the meaning of this sentence from the report, showing what it suggests about the 95% confidence interval.
Answer to relevant QuestionsFind the margin of error for a 95% confidence interval for estimating the population mean when the sample standard deviation equals 100, with a sample size of (i) 400 and (ii) 1600. What is the effect of the sample size? The researcher planning the study in South Africa also will estimate the population proportion having at least a high school education. No information is available about its value. How large a sample size is needed to ...You randomly sample five students at your school to estimate the proportion of students who like tofu. All five students say they like it. a. Find the sample proportion who like it. b. Find the standard error. Does its usual ...A poll of a random sample of n = 2000 Americans by the Pew Research Center (www.peoplepress.org ) indicated that 36% considered themselves “born-again” or evangelical Christians. How would you explain to someone who has ...When the GSS asked in 2004, “About how many hours per week do you spend sending and answering e-mail?” the eight males in the sample of age at least 75 responded: 0, 1, 2, 2, 7, 10, 14, 15. a. The TI – 83 + /84 screen ...
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