MATH 225N WEEK 8 FINAL EXAM (VERSION-1) (LATEST 2021)

MATH 225N WEEK 8 FINAL EXAM

QUESTION 1
1/1 POINTS
A fitness center claims that the mean amount of time that a
person spends at the gym per visit is 33 minutes. Identify the
null hypothesis, H0, and the alternative hypothesis, Ha, in terms
of the parameter μ.

That is correct!

H0: μ≠33; Ha: μ=33

H0: μ=33; Ha: μ≠33

H0: μ≥33; Ha: μ<33

H0: μ≤33; Ha: μ>33
Answer Explanation
Correct answer:
H0: μ=33; Ha: μ≠33
Let the parameter μ be used to represent the mean. The null
hypothesis is always stated with some form of equality: equal
(=), greater than or equal to (≥), or less than or equal to (≤).
Therefore, in this case, the null hypothesis H0 is μ=33. The
alternative hypothesis is contradictory to the null hypothesis,
so Ha is μ≠33.
QUESTION 2
1/1 POINTS

, The answer choices below represent different hypothesis tests.
Which of the choices are right-tailed tests? Select all correct
answers.

That is correct!




H0:X≥17.1, Ha:X<17.1







H0:X=14.4, Ha:X≠14.4







H0:X≤3.8, Ha:X>3.8







H0:X≤7.4, Ha:X>7.4







H0:X=3.3, Ha:X≠3.3

,




Answer Explanation
Correct answer:
H0:X≤3.8, Ha:X>3.8
H0:X≤7.4, Ha:X>7.4
Remember the forms of the hypothesis tests.
 Right-tailed: H0:X≤X0, Ha:X>X0.
 Left-tailed: H0:X≥X0, Ha:X<X0.
 Two-tailed: H0:X=X0, Ha:X≠X0.
So in this case, the right-tailed tests are:
 H0:X≤7.4, Ha:X>7.4
 H0:X≤3.8, Ha:X>3.8
QUESTION 3
0/1 POINTS
Find the Type II error given that the null hypothesis, H0, is: a
building inspector claims that no more than 15% of structures in
the county were built without permits.

That's not right.

The building inspector thinks that no more than 15% of the
structures in the county were built without permits when, in fact,
no more than 15% of the structures really were built without
permits.

, The building inspector thinks that more than 15% of the
structures in the county were built without permits when, in fact,
more than 15% of the structures really were built without
permits.

The building inspector thinks that more than 15% of the
structures in the county were built without permits when, in fact,
at most 15% of the structures were built without permits.

The building inspector thinks that no more than 15% of the
structures in the county were built without permits when, in fact,
more than 15% of the structures were built without permits.
Answer Explanation
Correct answer:
The building inspector thinks that no more than 15% of the
structures in the county were built without permits when, in fact,
more than 15% of the structures were built without permits.
A Type II error is the decision not to reject the null hypothesis
when, in fact, it is false. In this case, the Type II error is when
the building inspector thinks that no more than 15% of the
structures were built without permits when, in fact, more
than 15% of the structures were built without permits.
Your answer:
The building inspector thinks that more than 15% of the
structures in the county were built without permits when, in fact,
at most 15% of the structures were built without permits.
Content attribution- Opens a dialog
QUESTION 4
1/1 POINTS