TABLE 11-7 a Student Team in a Business Statistics Course Designed an Designed

question 38

True/False

TABLE 11-7
A student team in a business statistics course designed an experiment to investigate whether the brand of bubblegum used affected the size of bubbles they could blow. To reduce the person-to-person variability, the students decided to use a randomized block design using themselves as blocks. Four brands of bubblegum were tested. A student chewed two pieces of a brand of gum and then blew a bubble, attempting to make it as big as possible. Another student measured the diameter of the bubble at its biggest point. The following table gives the diameters of the bubbles (in inches) for the 16 observations.

-Referring to Table 11-7, the randomized block F test is valid only if the population of diameters has the same variance for the 4 brands.

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Definitions:

P-value

A statistical measure that helps scientists determine the significance of their research results, indicating the probability of observing the results if the null hypothesis is true.

Coffee Shop

A retail establishment that sells coffee, tea, and other beverages, often accompanied by snacks or light meals.

Supermarket Chain

A network of large retail stores offering a wide variety of goods including groceries and household items.

Kruskal-Wallis Test

A non-parametric method for testing whether samples originate from the same distribution, used when the assumptions of the ANOVA are not met.