TABLE 13-4
the Managers of a Brokerage Firm

question 23

Short Answer

TABLE 13-4
The managers of a brokerage firm are interested in finding out if the number of new clients a broker brings into the firm affects the sales generated by the broker. They sample 12 brokers and determine the number of new clients they have enrolled in the last year and their sales amounts in thousands of dollars. These data are presented in the table that follows.
$\begin{array}{lll}\text { Broker } & \text { Cliente } & \text { Sales } \\1 & 27 & 52 \\2 & 11 & 37 \\3 & 42 & 64 \\4 & 33 & 55 \\5 & 15 & 29 \\6 & 15 & 34 \\7 & 25 & 58 \\8 & 36 & 59 \\9 & 28 & 44 \\10 & 30 & 48 \\11 & 17 & 31 \\12 & 22 & 38\end{array}$


-Referring to Table 13-4, suppose the managers of the brokerage firm want to obtain a 99% confidence interval estimate for the mean sales made by brokers who have brought into the firm 24 new clients. The t critical value they would use is______ .

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Definitions:

Protostomes

A group of animals characterized by developing the mouth earlier than the anus during embryonic development, including invertebrates like mollusks and annelids.

Ecdysozoa

A group of protostome animals, including arthropods and nematodes, characterized by periodic shedding of their exoskeletons during growth.

Lophotrochozoa

A major group within the animal kingdom, which includes organisms that have either a lophophore for feeding or a trochophore larval stage in their development.

Deuterostomes

Animals characterized by the development of the anus from the first opening in the embryo, with humans and starfish as examples.