CISB Exam 2 || Possible Questions Accurately Answered.
Hypothesis testing is about proving something beyond a reasonable doubt. correct answers True
The first phase of a hypothesis test is to determine what we are testing. Which of the following is
not mentioned as a type of hypothesis test?
A)
A status quo test to see if operations are running normally or if a situation has changed.
B)
A similarity test that proves a value is equal to a desired value.
C)
A research hypothesis to prove a product is superior than an existing product.
D)
A test in order to prove a claim. correct answers B) A similarity test that proves a value is equal
to a desired value.
When writing the null and alternative hypothesis, which of the following is not true:
Question options:
A)
When testing for a mean, Ho and Ha is testing μ. Example, Ho: μ =12.
B)
When testing for a mean, Ho and Ha is testing xbar. Example, Ho: xbar = 12.
C)
Ho will always have an equality such as =, ≤, or ≥
D)
Ha should have the opposite sign of Ho, such as ≠, >, or <. correct answers B)
When testing for a mean, Ho and Ha is testing xbar. Example, Ho: xbar = 12.
,A large tire manufacturing company has claimed that its top line tire will average more than
80,000 miles. If a consumer group wished to test this claim, they would formulate the following
null and alternative hypotheses:
Ho: μ ≥ 80,000
Ha: μ ≠ 80,000 correct answers False
The police chief in a local city claims that the average speed for cars and trucks on a stretch of
road near a school is at least 45 mph. If this claim is to be tested, the null and alternative
hypotheses are:
Ho: µ < 45
Ha: µ ≥ 45 correct answers False
If an economist wishes to determine whether there is evidence that average family income in a
community exceeds $25,000. The best null and alternative hypothesis is:
Question options:
A)
Ho: µ > 25,000
Ha: µ ≤ 25,000
B)
Ho: µ = 25,000
Ha: µ ≠ 25,000.
C)
Ho: µ ≤ 25,000
Ha: µ > 25,000
D)
Ho: xbar ≤ 25,000
Ha: xbar > 25,000 correct answers C)
Ho: µ ≤ 25,000
Ha: µ > 25,000
, A company that makes shampoo wants to test whether the average amount of shampoo per bottle
is 16 ounces. The standard deviation is known to be 0.20 ounces. Assuming that the hypothesis
test is to be performed using 0.10 level of significance and a random sample of n = 64 bottles,
which of the following would be the correct formulation of the null and alternative hypotheses?
Question options:
A)
Ho: xbar = 16
Ha: xbar ≠ 16
B)
Ho: µ = 16
Ha: µ ≠ 16
C)
Ho: µ ≤ 16
Ha: µ > 16
D)
Ho: µ ≥ 16
Ha: µ < 16 correct answers B)
Ho: µ = 16
Ha: µ ≠ 16
If a hypothesis test is conducted for a population mean, a null and alternative hypothesis of the
form:
Ho: μ = 100
Ha: µ ≠ 100
will result in a one-tailed hypothesis test since the sample result can fall in only one tail. correct
answers False
Hypothesis testing is about proving something beyond a reasonable doubt. correct answers True
The first phase of a hypothesis test is to determine what we are testing. Which of the following is
not mentioned as a type of hypothesis test?
A)
A status quo test to see if operations are running normally or if a situation has changed.
B)
A similarity test that proves a value is equal to a desired value.
C)
A research hypothesis to prove a product is superior than an existing product.
D)
A test in order to prove a claim. correct answers B) A similarity test that proves a value is equal
to a desired value.
When writing the null and alternative hypothesis, which of the following is not true:
Question options:
A)
When testing for a mean, Ho and Ha is testing μ. Example, Ho: μ =12.
B)
When testing for a mean, Ho and Ha is testing xbar. Example, Ho: xbar = 12.
C)
Ho will always have an equality such as =, ≤, or ≥
D)
Ha should have the opposite sign of Ho, such as ≠, >, or <. correct answers B)
When testing for a mean, Ho and Ha is testing xbar. Example, Ho: xbar = 12.
,A large tire manufacturing company has claimed that its top line tire will average more than
80,000 miles. If a consumer group wished to test this claim, they would formulate the following
null and alternative hypotheses:
Ho: μ ≥ 80,000
Ha: μ ≠ 80,000 correct answers False
The police chief in a local city claims that the average speed for cars and trucks on a stretch of
road near a school is at least 45 mph. If this claim is to be tested, the null and alternative
hypotheses are:
Ho: µ < 45
Ha: µ ≥ 45 correct answers False
If an economist wishes to determine whether there is evidence that average family income in a
community exceeds $25,000. The best null and alternative hypothesis is:
Question options:
A)
Ho: µ > 25,000
Ha: µ ≤ 25,000
B)
Ho: µ = 25,000
Ha: µ ≠ 25,000.
C)
Ho: µ ≤ 25,000
Ha: µ > 25,000
D)
Ho: xbar ≤ 25,000
Ha: xbar > 25,000 correct answers C)
Ho: µ ≤ 25,000
Ha: µ > 25,000
, A company that makes shampoo wants to test whether the average amount of shampoo per bottle
is 16 ounces. The standard deviation is known to be 0.20 ounces. Assuming that the hypothesis
test is to be performed using 0.10 level of significance and a random sample of n = 64 bottles,
which of the following would be the correct formulation of the null and alternative hypotheses?
Question options:
A)
Ho: xbar = 16
Ha: xbar ≠ 16
B)
Ho: µ = 16
Ha: µ ≠ 16
C)
Ho: µ ≤ 16
Ha: µ > 16
D)
Ho: µ ≥ 16
Ha: µ < 16 correct answers B)
Ho: µ = 16
Ha: µ ≠ 16
If a hypothesis test is conducted for a population mean, a null and alternative hypothesis of the
form:
Ho: μ = 100
Ha: µ ≠ 100
will result in a one-tailed hypothesis test since the sample result can fall in only one tail. correct
answers False
