A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x, is found to be 18.8, and the samp standard deviation, s, is found to be 5.9. (a) Construct a 98% confidence interval about u if the sample size, n, is 33. (b) Construct a 98% confidence interval about μ if the sample size, n, is 55. How does increasing the sample size affect the margin of error, E? (c) Construct a 99% confidence interval about u if the sample size, n, is 33. How does increasing the level of confidence affect the size of the mar of error, E? (d) If the sample size is 20, what conditions must be satisfied to compute the confidence interval? C (a) Construct a 98% confidence interval about u if the sample size, n, is 33. Lower bound: Upper bound: (Round to two decimal places as needed.)

The safe load, L, of a wooden beam supported at both ends varies jointly as the width, w, and the square of the depth, d, and inversely as the length, l. A wooden beam 8in. wide, 7in. deep, and 2ft long holds up 27412lb. What load would a beam 5in. wide, 6in. deep, and 18ft. long, of the same material, support? Round your answer to the nearest integer if necessary.

The number of outraged varied directly as the number who were furious. If 600 were outraged when 200 were furious, how many were outraged when 100 were furious?

A courier travels from a warehouse to a manufacturing plant and back in 7.5 h total (i.e. the round trip is 7.5 h). His average speed from the warehouse to the plant is 95km/h, and from the plant to the warehouse is 55km/h. How long did it take to reach the plant?