Mean Profit
a Report Stated That the Mean Profit Margin

question 35

Short Answer

Mean Profit
A report stated that the mean profit margin of 1000 publicly held corporations is 7.5 percent and the standard deviation is 5.1 percent.Profit margins appear normally distributed.A financial analyst sampled 100 of these companies to test whether or not the mean and standard deviation are as stated.The sample results were: $$\begin{array} { | l | c | } \hline \text { Category } & \text { Frequency } \\\hline \text { Under } 2 & 6 \\2 - \text { under } 6 & 32 \\6 \text {-under } 10 & 34 \\10 \text {-under } 14 & 14 \\14 \text {-under } 18 & 6 \\18 \text { or more } & 8 \\\hline\end{array}$$
-A test for independence is applied to a contingency table with 4 rows and 5 columns for two nominal variables.Calculate the degrees of freedom for this test.

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Definitions:

Mood Disorder

A psychological disorder characterized by the elevation or lowering of a person's mood, such as depression or bipolar disorder.

Medication Dose

The specified amount of a drug or medication recommended to be taken at one time or over a prescribed period.

Suicide Risk Factor

Any aspect of a person's situation or characteristics that increases the likelihood they might consider, attempt, or die by suicide.

Older Adults

Individuals typically aged 65 or older, often considered a population group that may experience unique health, social, and economic challenges.