Test Hypotheses about a Population Proportion
-A brokerage firm needs information concerning the standard deviation of the account balances of its customers. From previous information it was assumed to be $\$ 250$. A random sample of 61 accounts was checked. The standard deviation was $\$ 286.20$. At $\alpha = 0.01$, test the firm's assumption. Assume that the account balances are normally distributed.

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The Answer of Test Hypotheses about a Population Proportion
-A brokerage firm needs information concerning the standard deviation of the account balances of its customers. From previous information it was assumed to be $\$ 250$. A random sample of 61 accounts was checked. The standard deviation was $\$ 286.20$. At $\alpha = 0.01$, test the firm's assumption. Assume that the account balances are normally distributed.

Test Hypotheses About a Population Proportion -A Brokerage Firm Needs $250\$ 250$250

Test Hypotheses About a Population Proportion
-A Brokerage Firm Needs $\$ 250$