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A number of minor automobile accidents occur at various high-risk intersections in Teton County despite traffic lights
The Tampa bay (Florida) Area Chamber of Commerce wanted to know whether the mean weekly salary of nurses was larger than that of school teachers
The following data are the heart rates (in beats per minute) of 12 regular before and after chewing smokeless tobacco. Does chewing make a difference
A common method of checking for pollution in a river is to measure the dissolved oxygen content in the river water at different locations
To learn about the effect of a newly developed gasoline additive on gas mileage (mpg), seven cars were driven 300 miles first without additive
To increase rainfall, extensive cloud-seeding experiments are to be conducted, and the results are to be compared with a baseline figure of .54 inch of rainfall
What are some of the ethical issues we encounter in using hypothesis testing? How might we discover if a researcher has compromised ethics
Production process is considered to be under control if the machine parts it makes have a mean length of 35.50 mm with a standard deviation of 0.45 mm
The college librarian believes that more than 60% of the books checked out by students were fictional material.
In a speech to the Chamber of Commerce, a city councilman claims that in his city less than 15% of the adult male population is unemployed.
In a sample of 88 children selected randomly from one town, it is found that 8 of them suffer from asthma. Find the P-value for a test of the claim
Lester Hollar is Vice President for Human Resources for a large manufacturing company. In recent years he has noticed an increase in absenteeism
Team A did OK, once some adjustments were made to their offense and defense. However, Coach Mi is not convinced that his team is evenly matched
A stockbroker at Critical Securities reported that the mean rate of return on a sample of 10 oil stocks was 12.6 percent with a standard deviation of 3.9
Flammability tests were conducted on children's sleepwear. The vertical semi restrained test was used, in which pieces of fabric were burned
The purpose of an operational definition is to:
According to 1972 article in a national newspaper the starting salaries at a certain national bank showed that on average males were paid more than female
A sample of 200 observations from the population indicated that X1 is 170. A sample of 150 observations from the second population revealed X2 to be 110.
As part of a study of corporate employees, the Director of Human Resources for PNC, Inc. wants to compare the distance traveled to work by employees
If a null hypothesis is rejected with a significance level of 0.05, is it also rejected with a significance level of 0.01? Why or why not?
The management of white Industries is considering a new method of assembling its three-wheel golf cart
The following sample data were obtained from three populations where the variances were not equal, and you wish to compare the populations.
Suppose you want to test the claim that the population mean(u) is < or equal to 25.6. Given a sample size of n=44 and a level of significance of 0.05
Past records suggest that the mean annual income, u1, of teachers in state of Utah is greater than or equal to the mean annual income, u2, of teachers in Oregon
The marketing manager of a large supermarket chain would like to determine the effect of shelf space on the sales of pet food.