BNAD 2 Val
A fast- food franchise is....
- The franchiser builds on a unacceptable site - The franchiser does not build on an acceptable site - The average number of automobiles that pass the intersection per hour
It is generally believed that no more than 0.50 of all babies in a town in Texas are born out of wedlock....
-The current proportion of babies born out of wedlock - H0: p<0.50 and HA: p>0.50
A statistics professor works tirelessly to catch students cheating on his exams....
1%
GPA.. At a 5% significane level, the critical values are...
1.645
Which of the following are one-tailed tests?
< or >
Which of the following are two- tailed tests?
= or not =
Type 2 error is often referred to as
A false negative
Type 1 error is often referred to as
A false positive
When conducting a hypothesis test for a given sample size, if ALPHA is increased from 0.05 to 0.10, then ______.
All are correct: The probability of incorrectly rejecting the null increases, the prob of incorrectly failing to reject the null decreases, the prob of Type 2 error decreases
The alternative hypothesis typically________.
Contests the status quo for which a corrective action may be required.
For a given sample size n,_______.
Decreasing the probability of a Type 1 error ALPHA will increase the probability of a Type 2 error BETA
GPA.. The decision is to...
Do not reject Ho, we cannot conclude that the mean GPA is significantly greater than 3.5
A 99% confidence interval for the population mean yields [-3.79, 5.86]...
Do not reject Ho; we cannot conclude that the mean differs from zero.
Consider the following competing hypotheses: Ho: u=0 and Ha: u not equal 0. The value of the test statistic is z=-1.38. If we choose a 5% significance level, then we....
Do not reject the null hip and conclude that the population mean is not significantly different from 0.
A Type 2 error occurs when we______.
Do not reject the null hypothesis when it is actually false
T/F A Type 2 error is made when we reject the null hypothesis and the null hypothesis is actually false.
False
T/F On the basis of sample information, we either "accept the null hypothesis" or "reject the null hypothesis."
False
T/F The alternative hypothesis typically agrees with the status quo.
False
T/F The critical value approach specifies a range of value, also called the rejection region, such that if the value of the test statistic falls into this range, we do not reject the null hypothesis.
False
In order to test the mean returns on a major index...
Greater than 2.03 and less than -2.03
A school teacher is worried...
H
Many cities around the United States are installing LED street lights....
H0:p> 0.84 and HA: p<0.84
GPA..In order to establish whether the mean GPA exceeds 3.5, the appropriated hypotheses are..
Ho: u<3.5 and Ha:u>3.5
The Boston public school...
Ho: u> 12 Ha: u<12 z=-2.00 5%? Yes, since p-value is less than ALPHA 1%? No, since p-value is greater than ALPHA
In general, the null and alternative hypotheses are__________.
Mutually exclusive
When we reject the null hypothesis when it is actually false we have committed_____.
No error
If the p- value for a hypothesis test is 0.07 and the chosen level of significance is .05, then the correct conclusion is to..
Not reject the null
A one- tailed hypothesis test of the population mean has...
Only one critical value
When conducting a hypothesis test for a given sample size, if the probability of a Type 1 error decreases, then the_____.
Probability of incorrectly accepting the null increases
What is the decision rule when using the p-value approach to hypothesis testing?
Reject Ho if the p-value is < ALPHA.
An analyst conducts a hypothesis test to check whether the mean return for a particular fund differs from 10%. He assumes that returns are normally distributed. Ho:u= 10 Ha: u not equal 10 Over the past 10 years the ...
Reject Ho: we can conclude that the mean differs from 10%
If the p- value for a hypothesis test is 0.027 and the chosen level of significance is .05, then the correct conclusion is to...
Reject the null
In order to test the man IQ of employees..
Reject the null hypothesis and conclude that the mean IQ is greater than 100.
A Type 1 error occurs when we _____.
Reject the null hypothesis when it is actually true
Which of the following answers represents the objective of a hypothesis test?
Rejecting the null hypothesis when it is false and not rejecting the null hypothesis when it is true
When conducting a hypothesis test, which of the following decisions represents an error?
Rejecting the null hypothesis when it is true
A recent report claimed that Americans are retiring in life (US News and World Report)..
Rejects the null and concludes that the mean retirement age has increased
Which of the following types of tests may be performed?
Right-tailed, left-tailed, and two-tailed test
The null hypothesis in a hypothesis test refers to__________.
The default state of nature
A university is interested in promoting graduates of its honors program by establishing that the mean GPA exceeds 3.5. A sample of 36 honors students is taken and is found to have a mean GPA equal to 3.6. The population standard deviation is assumed to equal 0.4. The parameter to be tested is....
The mean GPA of the university honor students
A local courier service advertises that its average delivery time is less than 6 hours for local deliveries. When teasing the two hypotheses, Ho:u>6 and HA: u<6, u stands for__________.
The mean delivery time
The national average for an 8th grade reading comprehension test is 73. A school district claims that its eighth-graders outperform the national average. In testing the school districts claim, how does one define the population parameter of interest?
The mean score on the 8th grade reading comprehension test.
If the null hypothesis will be rejected at a 1% significance level, then...
The null hypothesis will be rejected at a 5% significance level
A hypothesis test regarding the population mean based on____.
The sampling distribution of the sample mean
If the chosen significance level is ALPHA= 0.05, then______.
There is a 5% probability of rejecting a true null hypothesis
T/F A Type 1 error is committed when we reject the null hypothesis which is actually true.
True
T/F A hypothesis test regarding the population mean is based on the sampling distribution of the sample mean.
True
T/F As a general guideline, we use the alternative hypothesis as a vehicle to establish something new, or contest the status quo, for which a corrective action may be required.
True
T/F For a given sample size, any attempt to reduce the likelihood of making one type of error (Type 1 of Type 2) will increase the likelihood of the other error.
True
T/F In a one-tailed test, the rejection region is located under one tail (left or right) of the corresponding probability distribution, while in a two- tailed test this region is located under both tails.
True
T/F The null hypothesis typically corresponds to a presumed default state of nature.
True
T/F Under the assumption that the null hypothesis is true as a equality, the p-value is the likelihood of observing a sample mean that is at least as extreme as the one derived from the given sample.
True
A two-tailed hypothesis test of the population mean or population proportion has...
Two critical values, one positive and one negitive
A professional sports organization is going to implement a test for steroids....
Type 1: 4%, Type 2: 6%
The owner of a large car dealership ...
parameter: the mean number of customers visiting Ho: u>800 and Ha: u<800 test stat: z=1.429 critical value: -1.645 Do not reject Ho; we cannot conclude sig less than 800
GPA.. The value of the test stat is...
z=1.50
