The random variable X has mean 12 and standard deviation 3. The random variable W is defined as W=7+2X . What are the mean and s
2 answers:
Answer:
The mean and standard devaition of W are 6 and 31 respectively.
Step-by-step explanation:
Given that:
W = 7 + 2X
Variance (W) = Variance(7 + 2X)
For a term constant term, the variance is zero.
So;
W = 4 × Var(X)
W = 4 × (SD (X))²
W = 4 × (3)²
W = 4 × 9
W = 36
Thus, Variance (W) = 36
The standard deviation of W =
W =
W = 6
Also;
E(W) = E(7 +2 X)
E(W) = 7 + 2 × E(X)
where;
mean X = 12
E(W) = 7 + 2(12)
E(W) = 31
Thus, the mean and standard devaition of W are 6 and 31 respectively.
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At the null hypothesis, it is <u>tested if the mean length of jail time is still of 2.5 years</u>, that is:
At the alternative hypothesis, it is <u>tested if it has increased</u>, that is:
We have the <u>standard deviation for the population</u>, thus, the z-distribution is used. The test statistic is given by:
The parameters are:
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is the value tested at the null hypothesis.
is the standard deviation of the sample.
- n is the sample size.
For this problem, the values of the <u>parameters</u> are:
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The critical value for a <u>right-tailed test</u>, as we are testing if the mean is greater than a value, with a <u>significance level of 0.05</u>, is of
Since the <u>test statistic is greater than the critical value</u>, it can be concluded that the mean length of jail time has increased.
A similar problem is given at brainly.com/question/24166849
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Quadratic Equation
The equation ...
Y = 5x^2 - 30x + 95
can be written as ..
