Question

If manufacturer would like to minimise the probability of
rejecting the null

hypothesis when it is in fact true, which level of significance
would you recommend, the

1 percent or the 5 percent significance level? Explain why.

Answer #1

**THE PROBABILITY OF REJECTING THE NULL HYPOTHESIS WHEN IT
IS TRUE , THAT IS , REJECTION OF THE TRUE NULL HYPOTHESIS , WHICH
IS THE TYPE I ERROR .**

**AND PROBABILITY OF TYPE I ERROR IS EQUAL TO ALPHA(LEVEL
OF SIGNIFICANCE).**

**SO, TO MINIMISE THE THE PROBABILITY OF REJECTING THE
NULL HYPOTHESIS WHEN IT IS TRUE WE SHOULD USE LOW LEVEL OF
SIGNIFICANCE , THAT IS , BETWEEN 1 PERCENT AND 5 PERCENT ,WE SHOULD
USE 1 PERCENT .**

**AND THE REASON FOR USING LOW OR SETTING IT TO THE LOW
LEVEL OF SIGNIFICANCE MEANS WE
NEED**** STRONGER EVIDENCE AGAINST NULL
HYPOTHESIS BEFORE WE REJECT THE NULL HYPOTHESIS.**

**SO IF THE NULL HYPOTHESIS IS TRUE, WE WILL LESS LIKELY
TO REJECT IT.**

**I HOPE I WAS HELPFUL AND HAVE CLEARED YOUR
DOUBTS.**

**THANKYOU**

1.Type 1 error is...
a.Correctly rejecting the null hypothesis.
b.Rejecting the null hypothesis when it’s actually true.
c.Correctly failing to reject the null hypothesis.
d.Failing to reject the null hypothesis when it’s actually
false.
2.Power is defined as the probability of...
a.Correctly rejecting the null hypothesis.
b.Correctly failing to reject the null hypothesis.
c.Failing to reject the null hypothesis when it’s actually
false.
d.Rejecting the null hypothesis when it’s actually true.
3. From Study Example 1: Based on the sample,...

1. The P-value of a test of the null hypothesis is
a. the probability the null hypothesis is true.
b. the probability the null hypothesis is false.
c. the probability, assuming the null hypothesis is false, that
the test statistic will take a value at least as extreme as that
actually observed.
d. the probability, assuming the null hypothesis is true, that
the test statistic will take a value at least as extreme as that
actually observed.
2. The P-value...

The probability of committing a Type I error when the null
hypothesis is true as an equality is
a. The confidence level
b. p
c. Greater than 1
d. The level of significance

Question 14
For all tests of
hypothesis, the probability of rejecting the null hypothesis is a
function of
A.
the size of the
observed differences
B.
the alpha level and
the use of one- or two-tailed tests
C.
sample size
D.
all of the above
Question 15
The Central Limit
Theorem states that as sample size becomes large the population
distribution becomes normal.
True
False
Question 16
The area between the
mean and a Z score of + 1.50 is...

The primary purpose of hypothesis testing is to attempt to
reject the null hypothesis not to accept the alternative
hypothesis.
True
False
In hypothesis testing, a Type 1 error is
failing to reject the null hypothesis when it is true.
failing to reject the null hypothesis when it is false.
rejecting the null hypothesis when it is true.
rejecting the null hypothesis when it is false.
In general, the power of a statistical test is the probability
that a test...

The null hypothesis in
a hypothesis test refers to _____________.
Multiple Choice
the level of
significance
the default state of
nature or status quo
the probability of
rejecting the alternative hypothesis when it is false
a particular
population parameter specified with the sign ≠

If while conducting a hypothesis test you reject the null
hypothesis when in fact it was true, you would have made a

Question 5
When you reject the null hypothesis for the
relationship between age and opinions on abortion, you are
saying:
There is a relationship between age and opinions on abortion in
the population.
There is not a relationship between age and opinions on
abortion in the population.
You are saying nothing about the population.
You are saying that the measure of association between age and
opinions on abortion in the population is 0.
Question 6
If your Phi measure...

Stats Homework
1. In your own words describe what is meant by a null
hypothesis.
2. In your own words describe what is meant by a research
hypothesis.
3. For the following four questions (A-D), use a distribution
with a mean of 47 and a standard deviation of 7.4.10.
A. What is the probability of a score falling between a raw
score of 42 and 52?
B. What is the probability of a score falling above a raw score
of...

1. True or False? If we would reject a null hypothesis at the 5% level, we would also reject it at the 1% level.
2. True or False? Other things being equal, a small level of
significance is desirable

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