# Question

Use the following information x-bar = 50, σ = 15, n = 90, N = 1,000--to calculate confidence intervals for assuming the sample is from a normal population:

(a) 90 percent confidence;

(b) 95 percent confidence;

(c) 99 percent confidence.

(a) 90 percent confidence;

(b) 95 percent confidence;

(c) 99 percent confidence.

## Answer to relevant Questions

Find ht interval [ μ – z σ / √ n μ + z σ / √ n = within which 95 percent of the sample means would be expected to fall, assuming that each sample is from a normal population. a. μ = 200, σ = 12, n = 36 b. μ = ...The EPA city/hwy mpg range for a Saturn Vue FWD automatic 5-speed transmission is 20 to 28 mpg. (a) Estimate using Method 3 from Table 8.11. (b) If you owned this vehicle, how large a sample (e.g., how many tanks of gas) ...What sample size would be needed to estimate the true proportion of American households that own more than one DVD player, with 90 percent confidence and an error of ±0.02? Find the 90 percent confidence interval for the standard deviation of gasoline mileage mpg for these 16 San Francisco commuters driving hybrid gas-electric vehicles. 8.67 Sixteen owners of 2010 Audi A4 sedans kept track of their average fuel economy for a month. The results are shown below. (a) Construct a 95 percent confidence interval for the mean. (b) What factor(s) limit the ...Post your question

0