A garbage collector believes that he averages picking up more than four tons of garbage per day. What is the null hypothesis for his statement?

Which type of null hypothesis is used in the figure below?

Which type of alternative hypothesis is used in the figure below?

A recent survey indicated that the average amount spent for breakfast by business managers was $7.58 with a standard deviation of $0.42. It was felt that breakfasts on the West Coast were higher than $7.58. A sample of 81 business managers on the West Coast had an average breakfast cost of $7.65. Give the p-value for the data provided above.

The Eagle Ridge Contractors Association claims the average price of a home in their subdivision is $125,150 with a standard deviation of $7,350. A sample of 36 homes for sale in this subdivision had an average selling price of $123,550. Is there evidence that the costs of homes for sale in this subdivision are actually lower than claimed? What is the p-value for a one-sided test of the data provided above?

A recent report from the American Medical Association claims that for the first time in 10 years, the average salary of psychiatrists was $189,121 with a standard deviation of $26,975. A random sample of 64 psychiatrists this year yielded an average salary of $198,630. Is there evidence that the average salary is actually higher than what the American Medical Association reported? At α = 0.05 , what is the p-value for a one-sided test?

The null hypothesis states that there is no difference between a parameter and a specific value, or that there is no difference between two parameters.

Sandra Johnson, a researcher, believes her pulse rate will decrease with exercise. Her alternative hypothesis would contain an equal sign.

Stating the hypothesis is the first step used in hypothesis testing.