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Reconsider Example 10.8 involving an investigation of the effects of different heat treatments on the yield point of steel ingots.

a. If J = 8 and\(\sigma = 1\), what is\(\beta \)for a level .05 F test when\({\mu _1} = {\mu _2},\,\,\,{\mu _3} = {\mu _1} - 1\,\), and\({\mu _4} = {\mu _1} + 1\)?

b. For the alternative of part (a), what value of J is necessary to obtain\(\beta = .05\)?

c. If there are I = 5 heat treatments, J = 10, and\(\sigma = 1\), what is\(\beta \)for the level .05 F test when four of the\({\mu _i}\)鈥檚 are equal and the fifth differs by 1 from the other four?

Short Answer

Expert verified

The part(a), part(b) and part(c) is

  1. \(\beta \approx 0.9\,\)
  2. \(J = 9\)
  3. \(\beta \approx 0.55\,\)

Step by step solution

01

what is \(\beta \) Part(a)

For given values, the \({\phi ^2}\) value is

\(\phi 2 = \frac{{2\,.\,\left( {{0^2} + {0^2} + {{\left( { - 1} \right)}^2} + {1^2}} \right)}}{1} = 4\)

Where

\({\alpha _1} = {\alpha _2} = 0\,,\,\,{\alpha _3} = - 1\,,\,\,{\alpha _4} = 1\)

Hence, the \(\phi \) value is

\(\phi = 2\)

Degrees of freedom for the F test are \({v_1} = 4 - 1 = 3\) and \({v_2} = 4\,\,.\,\left( {6 - 1} \right) = 20\). The power is approximately 0.9 using the figure

\(\beta \approx 0.9\,\)

02

Value of J Part(b)

Considering the fact that

\({\phi ^2} = \frac{1}{2}\,\,.\,\,J\)

or equally

\(\phi = 0.707\,\,.\,\,\sqrt J ,\)

And the fact that the degrees of freedom \({v_2}\) are

\({v_2} = 4\,\,.\,\left( {J - 1} \right),\)

From the given figure you can conclude that

\(J = 9\)

03

The fifth differs by 1 from the other fourPart(c)

Four of the \({\mu _1}\)鈥榮 is equal, let

\({\mu _i} = {\mu _j}\,,\,\,\,\,i\,,\,j\,\, \in \,\left\{ {1,2,3,4} \right\}\)

And let

\({\mu _5} = {\mu _1} + 1\)

From this, the value of \({\alpha _i}\) can be computed. Since

\(\mu = {\mu _1} + \frac{1}{5}\)

The following are \({\alpha _i}\) s

\(\begin{aligned}{l}{\alpha _i} = - \frac{1}{5},\,\,\,i = 1,2,3,4,\\{\alpha _5} = \frac{4}{5}\end{aligned}\)

Using the same formula, the value of \({\phi ^2}\) is

\({\phi ^2} = \frac{2}{1}.\frac{{20}}{{25}} = 1.6\)

Hence, the value of \(\phi \) is

\(\phi = 1.26\)

Degrees of freedom for the F test are \({v_1} = 5 - 1 = 4\) and \({v_2} = 5\,\,.\,\left( {10 - 1} \right) = 45\). The power is approximately 0.55 using the figure

\(\beta \approx 0.55\,\)

Here, the final result is,

  1. \(\beta \approx 0.9\,\)
  2. \(J = 9\)
  3. \(\beta \approx 0.55\,\)

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Most popular questions from this chapter

consider the accompanying data on plant growth after the application of five different types of growth hormone.

\(\begin{aligned}{l}1:\\2:\\3:\\4:\\5:\end{aligned}\) \(\begin{aligned}{l}13\\21\\18\\7\\6\,\end{aligned}\) \(\begin{aligned}{l}17\\13\\15\\11\\11\,\,\end{aligned}\) \(\begin{aligned}{l}7\\20\\20\\18\\15\,\,\end{aligned}\) \(\begin{aligned}{l}14\\17\\17\\10\\8\end{aligned}\)

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\(\begin{aligned}{l}4:309.2\\6:402.1\\8:392.4\\10:346.7\\12:407.4\end{aligned}\) \(\begin{aligned}{l}409.5\\347.2\\366.2\\452.9\\441.8\end{aligned}\) \(\begin{aligned}{l}311.0\\361.0\\351.0\\461.4\\419.9\end{aligned}\) \(\begin{aligned}{l}326.5\\404.5\\357.1\\433.1\\410.7\end{aligned}\) \(\begin{aligned}{l}316.8\\331.0\\409.9\\410.6\\473.4\end{aligned}\) \(\begin{aligned}{l}349.8\\348.9\\367.3\\384.2\\441.2\end{aligned}\) \(\begin{aligned}{l}309.7\\381.7\\382.0\\362.6\\465.8\end{aligned}\)

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