It is known that the duration of consultation with patients in a psychiatry clinic is normally distributed with an average…

Oxygen levels are measured to control breathing in symptoms of a disease. In the measurements taken from 242 people, it…

A student suspected the average cost of a date was no longer \$30.00 To test her hypothesis, she randomly selected…

ABC Company claims that the proportion of its employees investing in individual investment accounts is higher than national proportion of…

Data from the Framingham study allow us to compare the distribution of initial serum cholesterol levels for two population of…

A physician claims that 13.6% of all pregnant females smoke during their pregnancy. A random sample of 400 pregnant women…

A math instructor has written a new placement exam. He is concerned that the exam may be too long. The…

A medical doctor wishes to test the claim that the standard deviation of the systolic blood pressure of deep sea…

Two business schools, A and B, located in the same metropolitan area and they are competing for bragging rights. One…

A researcher claims that average body temperature is different for the two genders. A sample of 65 men and 65…