A Random Sample Of 100 Automobile Owners In A Region Shows That An Automobile Is Driven On Average 25 500 Kilometers Per 1 (20.66 KiB) Viewed 27 times
A Random Sample Of 100 Automobile Owners In A Region Shows That An Automobile Is Driven On Average 25 500 Kilometers Per 2 (18.4 KiB) Viewed 27 times
A random sample of 100 automobile owners in a region shows that an automobile is driven on average 25,500 kilometers per year with a standard deviation of 4100 kilometers. Assume the distribution of measurements to be approximately normal. (a) Construct a 90% confidence interval for the average number of kilometers an automobile is driven annually in the region. (b) What can we assert with 90% confidence about the possible size of our error if we estimate the average number of kilometers driven by car owners in the region to be 25,500 kilometers per year? Click here to view page 1 of the standard normal distribution table. of the standard normal distribution table. Click here to view Click here to view page 2 page 1 Click here to view page 2 of the table of critical values of the t-distribution. of the table of critical values of the t-distribution.
A machine produces metal pieces that are cylindrical in shape. A sample of pieces is taken, and the diameters are found to be 0.94, 0.96, 0.97, 1.05, 0.99, 0.98, 1.02, 0.94, and 0.94 centimeters. Find a 90% confidence interval for the mean diameter of pieces from this machine, assuming an approximately normal distribution. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. Click here to view page 1 of the table of critical values of the t-distribution. Click here to view page 2 of the table of critical values of the t-distribution. The confidence interval is << (Round to three decimal places as needed.) (...)
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