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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.
Determine what would happen to your critical value (Z) if you were to change the level of significance (a) from .05 to .1 in a two tailed hypothesis test.
According to the historical data, the life expectancy in Argentina is equal to the life expectancy in Bolivia.
The manager of a computer software company wishes to study the number of hours senior executives spend at their desktop computers by type of industry
A machine produces 3 inch nails. A sample of 10 nails was selected and the lengths determined:
All Seasons Plumbing has two service trucks which frequently break down. If the probability the first truck is available is .75
A researcher claims that the average age of a woman before he has her first child is now greater than it was in 1990.
Suppose a candidate running for sheriff claims that she will reduce the average speed of emergency response to less than 3o minutes.
The NCAA requires colleges to report the graduation rates of their athletes. At one large university 70.7% of all students who entered between 1989 and 1991