5. The random variable X is the shear strength of a weld. It is known that X has a normal distribution with mean and variance o2. A random sample of 10 observations is taken yielding the following data (in psi): 392 376 401 367 389 362 409 415 358 375 (a) The maximum likelihood estimators for u and o2 were shown in class to be

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5. The random variable X is the shear strength of a weld. It is known that X has a normal
distribution with mean µ and variance o². A random sample of 10 observations is taken
yielding the following data (in psi):
392 376 401 367 389 362 409 415 358 375
(a) The maximum likelihood estimators for u and o2 were shown in class to be
Σ₁₁(X₂ - X)²
û = X and
2 =
n
respectively. Compute the maximum likelihood estimates of u and o2 with the data
given. Use the Statistics mode in your calculator.
Watch the video on "Univariate Statistics with Casio Calculator" on Moodle for your
calculator.
(b) Recall that (2) = P(Z ≤ 2) where Z~ N(0, 1). Express P(X ≤ 350) as a Þ(.).
(c) Use the invariance principle to find the maximum likelihood estimate of P(X ≤ 350).
(d) Find the maximum likelihood estimate of the strength below which 90.15% of all welds
will have their strengths. Round your answer to 2 decimal places.
Transcribed Image Text:5. The random variable X is the shear strength of a weld. It is known that X has a normal distribution with mean µ and variance o². A random sample of 10 observations is taken yielding the following data (in psi): 392 376 401 367 389 362 409 415 358 375 (a) The maximum likelihood estimators for u and o2 were shown in class to be Σ₁₁(X₂ - X)² û = X and 2 = n respectively. Compute the maximum likelihood estimates of u and o2 with the data given. Use the Statistics mode in your calculator. Watch the video on "Univariate Statistics with Casio Calculator" on Moodle for your calculator. (b) Recall that (2) = P(Z ≤ 2) where Z~ N(0, 1). Express P(X ≤ 350) as a Þ(.). (c) Use the invariance principle to find the maximum likelihood estimate of P(X ≤ 350). (d) Find the maximum likelihood estimate of the strength below which 90.15% of all welds will have their strengths. Round your answer to 2 decimal places.
Expert Solution
Step 1

Let the random variable X denote the shear strength of a weld.

Here X follows normal with mean μ and variance σ2.

The sample of 10 observations is given as follows:

 392 376 401 367 389 362 409 415 358 375

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