A union representative has collected some data on the hourly pay of workers in the area. He is curious to find out if hourly pay actually increases with age. He does not have the actual ages of the workers in his sample, but he does have age group information. For now, he wishes to compare the young workers (18-30 years old) with the middle aged workers (31-45 years old) by calculating a confidence interval for the difference in population mean salaries. How would the 99 confidence interval for the difference in average hourly pay compare to the 90 confidence interval?
Question 2
A television station plans to ask a random sample of 400 city residents if they can name the news anchor on the evening news at their station. They plan to fire the news anchor if fewer than 10 of the residents in the sample can do so. Suppose that in fact 12 of city residents could name the anchor if asked. What is the approximate probability that the anchor will be fired?
a. 0.02
b. 1.23
c. 0.11
d. 0.89
Lung cancer. Photograph of part of a lung removed after death. The yellow area is a large tumor and
Model of a longitudinal study in which 983 students were surveyed in 1984 and then again in 1985, 19
The inguinal area. Take great care when applying deep pressure in this region
The population of algae is compared to the population of corals in a given sampling area
Type II curve. Mortality does not vary with age. Data for five-lined skink (Eumeces fasciatus).