A product development scientist is tasked with determining which of three methods is the most effective for catching fruit flies: a sticky paper trap, a liquid trap, or a container trap. The scientist hypothesizes that all three methods will be equally effective at catching the fruit flies. To investigate, he releases a random sample of 300 fruit flies in an enclosed area containing each of the three traps. What are the appropriate hypotheses?
After a product recall, a company solicits feedback from a random sample of 100 customers regarding their opinion about the company since the recall. Customers were asked, "Do you approve, disapprove, or have no opinion about the company?” The public relations department is concerned that the opinions may be equally distributed across these three options. They decide to carry out a test of significance. What is the name of the appropriate inference procedure?
A company is started by four friends. The company was Erica’s idea, so she wants to fill 70 percent of the orders. Jen, Heather, and Tonya each agree to fill 10 percent of the orders. After a successful first year, Erica wants to determine if the distribution of the number of orders filled is adhering to the agreed-upon percentages. To do so, she selects a random sample of 100 orders from the large number of orders that were filled and determines who filled the order. What is the name of the appropriate inference procedure?
A flight attendant selects a random sample of 201 travelers. For each, he records the class in which the person travels and whether they have carry-on luggage. He would like to know if there is convincing evidence that the class in which a person travels is associated with having carry-on luggage. Let alpha is equal to 0 point 0 5 What are the hypotheses for this test?
As products come off a large assembly line, they are inspected for quality. They are placed into one of three categories: pass, fail, or need additional inspection. The manager claims that 80 percent of the products pass the inspection, 5 percent fail, and 15 percent need additional inspection. In an effort to increase the passing rate, the machines are recalibrated. After this recalibration, a random sample of 100 products is selected. It is discovered that 85 passed inspection, 2 failed, and 13 needed additional inspection. The manager would like to know if there is convincing evidence that the distribution has changed. What is the value of the chi-square test statistic and cap p -value? Use the chi-square distribution table.
The health inspector would like to know if these data provide convincing evidence that the distribution of strep throat status differs across the departments in the population of all workers of this large company. What is the appropriate inference procedure?
The scientist would like to know if these data provide convincing evidence that the distribution of education differs for these regions in the population of all tristate residents. What is the appropriate inference procedure?
The conditions for inference are met. The chi-square test statistic is chi squared is equal to 10 point 6 7 What conclusion should be made using alpha is equal to 0 point 0 5 ? Use the chi-square table.
Which is the correct conclusion? Use the chi-square distribution table.
She would like to know if these data provide convincing evidence that the distribution of job status differs among the populations of all 9th, 10th, 11th, and 12th graders at this large high school. What are the appropriate hypotheses?
Did you find these answers helpful?