# Question

Explain exactly what we mean when we say that a sample of size n makes us 99 percent confident that x̅ is within E units of μ.

## Answer to relevant Questions

Consider a population having a standard deviation equal to 10. We wish to estimate the mean of this population. a. How large a random sample is needed to construct a 95 percent confidence interval for the mean of this ...Referring to Exercise 8.20, regard the sample of 10 sales figures (which has standard deviation 32.866) as a preliminary sample. How large a sample of sales figures is needed to make us 95 percent confident that x-bar, the ...Suppose that 60 percent of 1,000 randomly selected U.S. adults say that they take part in some form of daily activity to keep physically fit. Based on this finding, find a 95 percent confidence interval for the proportion of ...Suppose we conduct a poll to estimate the proportion of voters who favor a major presidential candidate. Assuming that 50 percent of the electorate could be in favor of the candidate, determine the sample size needed so that ...How safe are child car seats? Consumer Reports (May 2005) tested the safety of child car seats in 30 mph crashes. They found “slim safety margins” for some child car seats. Suppose that Consumer Reports simulates the ...Post your question

0