In systems of equations in problem 23 – 36 may have unique solutions, as infinite number of solutions, or no solution. Use matrices to find the general solution of each system, if solution exists. 28. { 2 x + y − z = 2 x − y + 2 z = 3 x + y − z = 1
In systems of equations in problem 23 – 36 may have unique solutions, as infinite number of solutions, or no solution. Use matrices to find the general solution of each system, if solution exists. 28. { 2 x + y − z = 2 x − y + 2 z = 3 x + y − z = 1
Solution Summary: The author explains how to determine the general solution of a given system by writing the equations in the form of an augmented matrix.
In systems of equations in problem 23 – 36 may have unique solutions, as infinite number of solutions, or no solution. Use matrices to find the general solution of each system, if solution exists.
28.
{
2
x
+
y
−
z
=
2
x
−
y
+
2
z
=
3
x
+
y
−
z
=
1
You may need to use the appropriate appendix table or technology to answer this question.
You are given the following information obtained from a random sample of 4 observations.
24
48
31
57
You want to determine whether or not the mean of the population from which this sample was taken is significantly different from 49. (Assume the population is normally distributed.)
(a)
State the null and the alternative hypotheses. (Enter != for ≠ as needed.)
H0:
Ha:
(b)
Determine the test statistic. (Round your answer to three decimal places.)
(c)
Determine the p-value, and at the 5% level of significance, test to determine whether or not the mean of the population is significantly different from 49.
Find the p-value. (Round your answer to four decimal places.)
p-value =
State your conclusion.
Reject H0. There is insufficient evidence to conclude that the mean of the population is different from 49.Do not reject H0. There is sufficient evidence to conclude that the…
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