Chapter 9: Hypothesis Testing with One Sample

A sociologist claims the probability that a person picked at random in Times Square in New York City is visiting the area is 0.83. You want to test to see if the proportion is actually less. What is the random variable? Describe it in words.

Assume $H_0:\mu \le 6$ and $H_a:\mu >6.$Is this a left-tailed, right-tailed, or two-tailed test?

Assume $H_0:p=0.25$ and $H_a:p\ne 0.25.$ Is this a left-tailed, right-tailed, or two-tailed test?

Draw the general graph of the left-tailed test.

Draw the graph of a two-tailed test.

Draw the graph of a two-tailed test.

A bottle of water is labeled as containing 16 fluid ounces of water. You believe it is less than that. What type of test would you use?

Your friend claims that his mean golf score is 63. You want to show that it is higher than that. What type of test would

you use?

A bathroom scale claims to be able to identify correctly any weight within a pound. You think that it cannot be that

accurate. What type of test would you use?

A bathroom scale claims to be able to identify correctly any weight within a pound. You think that it cannot be that

accurate. What type of test would you use?