Question

1.

The power of a statistical hypothesis test should be

Group of answer choices

small

large

equal to 1 - α

2.

If the Type II error rate of a statistical hypothesis test is 0.15,

Group of answer choices

the Type I error rate is 0.15

the Type I error rate is 0.85

the power is 0.15

the power is 0.85

3.

If sampled observations are from a normal distribution, the QQplot should look

Group of answer choices

bell-shaped

u-shaped

linear

4.

An important assumption for validity of a t-test is that

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the population should have a normal distribution

the sample should have a normal distribution

the sample mean should have a normal distribution

Answer #1

1. The power of a statistical hypothesis test should be large.

Since the power lies between 0 and 1 and if it is close to 1 the test is very good at detecting a false null hypothesis.

2. If the Type II error rate of a statistical hypothesis test is 0.15, the power is 0.85

reason: power = 1- type 2 error

3. If sampled observations are from a normal distribution, the QQplot should look linear

4.

An important assumption for validity of a t-test is that the population should have a normal distribution

You complete a hypothesis test using a = .05, and based
on the evidence from the sample, your decision is to reject the
null hypothesis. If the treatment actually has no effect, which of
the following is true?
Group of answer choices
You have made a Type I error.
You have made a Type II error.
You might have made a Type I error, but the probability is only
5% at most.
You have made the correct decision.
For a...

The hypothesis test:
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has no tails
is two-tailed
is left-tailed
is right-tailed
The following are a random sample of adult ski sweater prices
are from the Gorsuch Ltd. Winter catalog:
{$212, $292, $278, $199$280, $236}
Assume the underlying sweater price population is approximately
normally distributed. A hypothesis test is done to determine
whether the average price of all adult ski sweaters from Gorsuch
Ltd. is at least $275.
The correct distribution to use for the hypothesis...

A two-sided hypothesis test is being conducted for testing the
mean of a normal distribution at the 85% level. The hypothesized
mean value is 84 whereas the true mean is 86 with the variance
being equal for both the hypothesized and real distributions at the
value of 17.20. The sample size is 10. What are the values of the
following in the asked order: Pr(Failing to reject the null
hypothesis when it is false), Pr(Rejecting the null hypothesis when
it...

To find the sampling distribution of x bar, we need to:
Group of answer choices
Compute the mean of the standard error
Compute the mean of the proportion
Collect many samples, then find the mean of each sample
Collect many samples, then find the mean of the proportion
To use the Central Limit Theorem:
Group of answer choices
We need to know the type of distribution the underlying
population follows
We do not need to know the type of distribution...

A. CHECK ALL THAT ARE CORRECT: The t-distribution is
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flatter and more spread out than the normal distribution
closer to the normal distribution when df is very high
closer to the normal distribution when df is very low
more positively skewed than the normal distribution
B. In the context of a one-sample t-test, what is the
estimated standard error, sm, for a sample size of n = 4
with s2 = 16?
c. For a one...

1. In a standard normal distribution, the
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mean is 1 and the standard deviation is 0.
mean and the standard deviation can have any value.
mean is 0 and the standard deviation is 1.
mean and the standard deviation are both 1.
2.
For the density curve below, which of the following is true?
Group of answer choices
It is skewed left.
The mean is about 0.7.
The total area under the curve is 1.
It...

If I want to compare the performance of a particular group to an
established, accepted average but information about the population
standard deviation is not available. I should
Group of answer choices
conclude this cannot be done.
conduct a one-sample t-test.
conduct a one-sample z-test.
conduct a correlated t-test.
Why, in some cases, is a measure of association needed in
addition to a p-value for a statistical test?
Group of answer choices
The p-value only specifies the reliability of the...

(a) standard error (b)
F-ratio
(c) assumption (d) degrees of freedom
(e) null hypothesis (f) control
group (g)
experiment (h) alternative
hypothesis
(i)
power
(j) normal distribution (k) randomness (l)
directional test
(m) effect
size
(n)
single-blind
(o) double-blind (p) sampling distribution
(q) Type I error
(r) Type II
error (s)
Cohen’s d (t) central limit
theorem
1) The probability to reject the null hypothesis (when it is
indeed false) refers to ( type I...

Assume that a hypothesis test of the given claim will be
conducted. Identify the type I or type II error for the test.
The principal of a school claims that the percentage of students
at his school that come from single-parent homes is 11%. Identify
the type II error for the test.
Group of answer choices

For each hypothesis, the specific statistical test appropriate
for testing the hypothesis should be described and a brief
description of why the chosen test is most appropriate should be
included.
One Sample t-test, Two sample t-test, Two related
(correlated/paired/dependent)sample t-test, One Factor (one way)
analysis of variance (ANOVA), Factorial for two way/facot Analysis
of Variance (Anova), One Variable Chi-Square test, two variable chi
square test, correlation, or linear regression
Example:
1. People who work in a sedentary job are more...

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