Assuming x is normally distributed; use the following information to compute a 90% confidence interval to estimateµ.
Answer to relevant QuestionsIf a random sample of 41 items produces x̄ = 128.4 and s = 20.6, what is the 98% confidence interval for µ? Assume x is normally distributed for the population. What is the point estimate?Some fast-food chains offer a lower-priced combination meal in an effort to attract budget-conscious customers. One chain test-marketed a burger, fries and a drink combination for $1.71.The weekly sales volume for these ...Suppose a random sample of 85 items has been taken from a population and 40 of the items contain the characteristic of interest. Use this information to calculate a 90% confidence interval to estimate the proportion of the ...For each of the following sample results, construct the requested confidence interval. Assume the data come from normally distributed populations.a. n = 12, x̄ = 28.4, s2 = 44.9;99% confidence for σ2b. n = 7, x̄ = 28.4, s ...What proportion of secretaries of Fortune 500 companies has a personal computer at his or her workstation? You want to answer this question by conducting a random survey. How large a sample should you take if you want to be ...
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