## Confidence Intervals Miscellaneous on-line topics for Finite Mathematics 2e

Index of On-Line Text
Text for This Topic
Everything for Finite Math
Everything for Calculus
Everything for Finite Math & Calculus
Utility: Normal Distribution Utility
Table: Normal Distribution Table
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Following is a little table of \$z-\$values. For a separate window showing values of \$t_{α/2},\$ press here. (You can also use the \$t\$infinity row in place of the \$z-\$table.)
 \$\color{blue}{z_{.1}}\$ \$\color{blue}{z_{.05}}\$ \$\color{blue}{z_{.025}}\$ \$\color{blue}{z_{.01}}\$ \$\color{blue}{z_{.005}}\$ \$\color{blue}{z_{.001}}\$ \$\color{blue}{z_{.0005}}\$ \$1.282\$ \$1.645\$ \$1.960\$ \$2.326\$ \$2.576\$ \$3.090\$ \$3.291\$

1. Teenage Entertainment A random sample of 49 teenagers was surveyed, and the average number of movies that they had rented in the past week was \$1.9,\$ with a sample standard deviation of \$0.5.\$ Construct a \$95%\$ confidence interval for the average number of movies rented by teenagers in a week. (Round answers to \$2\$ decimal places.)

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(b) Your regional manager at Sonic Video responds with the following memo:

TO: G.E.Cost
FROM: V. Meluzio