TABLE 13-4
the Managers of a Brokerage Firm Are

question 10

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 both a 99% confidence interval estimate and a 99% prediction interval for X = 24. The confidence interval estimate would be the_____ (wider or narrower) of the two intervals.

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Definitions:

Grams

A metric unit of mass equal to one thousandth of a kilogram.

Alleles

Different forms of a gene that exist for a particular trait, where variation can lead to differences in the expressed features of organisms.

Teratogens

Substances that during pregnancy can cause development disorders or birth defects in the unborn child.

Enzyme

Biological molecules that significantly speed up the rate of virtually all of the chemical reactions within cells.