STAT 211 EXAM 3 QUESTIONS AND 100%
CORRECT ANSWERS!!
When does sampling error occur?
When a sample statistic is not equal to the population parameter as a result of chance factors
If a sample means is different from a particular population u (mew), we can conclude that
the sample mean probably represents some other population or that
The sample mean occurred as a result of sampling error
The key difference between parametric and nonparametric procedures is that parametric
procedures
Require certain stringent assumptions be met
What are the assumptions that are to be made when dealing with parametric procedures?
The population of the Dependent variable forms a normal distribution and the scores are of an
interval/ratio scale
Inferential statistics are used to
Decide whether sample data represent a particular relationship in the population
Which of the following assumptions is common to all Parametric statistics?
The population of dependent scores, which must be interval or ratio scores, forms a normal
distribution.
Which of the following is correct regarding experimental hypotheses?
They describe the predicted relationship we may or may not find in an experiment.
When is a two-tailed test used?
When a relationship is predicted without stating the direction in which the scores will change.
Relationship but no direction
When is a one-tailed test used?
,When a relationship is predicted and the direction in which the scores will change is predicted.
Relationship and direction
Which of the following is correct regarding Statistical hypotheses?
They describe the population parameters our sample data represent if there is or is not a predicted
relationship
Which of the following is correct regarding the alternative hypothesis?
They describe the population parameters represented by the sample data if the predicted
relationship exists.
Which of the following describes the situation if the relationship you are testing in your
experiment really exists?
The alternative hypothesis
Which of the following is true of any one-sample experiment?
We must know the population mean under some condition of the independent variable other than
the one being tested.
The null hypothesis describes the?
Population parameters represented by the sample data if the predicted relationship does not exist.
Which of the following is called the hypothesis of "no difference"
The null hypothesis
Which of the following alternative hypotheses would require a two-tail test?
Ha (alternative hypothesis): u (population mean) does not equal 100
Which hypothesis is actually being tested in statistical hypothesis testing?
The null hypothesis Ho
When can the z-test be used in statistical hypothesis testing?
When the raw score population's standard deviation is known.
, What does the null sampling distribution describe?
The sampling distribution when the null hypothesis is true.
In using a sampling distribution of means for statistical hypothesis testing, the mean of the
sampling distribution will always be equal.
To the u(mew) describe by the Ho (null hypothesis)
sample mean = population mean described by null
What does alpha always represent in statistical hypothesis testing?
The relative size of the region of rejection.
For a two-tailed test where alpha=0.05, zcrit is always equal to
negative/positive 1.96
If Xbar (sample mean)=82 u(population mean)=79 Qx(raw score of population)=15, and
N=25 what is Zobt?
1.00 because
82-79=3, then you must divide by Qx, where Qx= Qx/The square root of N. so 15/sr25 =
15/5=3....
so 3/3=1.00
If Xbar (sample mean)=34, u=37, Qx=8, and N=12, what is the value of Zobt?
-1.30
If Xbar=53, u=51, Qx=10, and N=15, what is the value of Zobt?
0.78
For Ho (null hypothesis): u=50, Ha: u does not = 50, Xbar=52, Qx=3, N=16, and alpha is
0.05, what is the appropriate outcome of a z-test?
Zcrit=+-1.96, Zobt=2.67, Reject Ho and Accept Ha... reject null accept alternative
For Ho: u is less than or equal too 76, Ha: u>76, Xbar=78, Qx=5, N=25, and alpha is 0.05,
what is the appropriate outcome of a z-test?
CORRECT ANSWERS!!
When does sampling error occur?
When a sample statistic is not equal to the population parameter as a result of chance factors
If a sample means is different from a particular population u (mew), we can conclude that
the sample mean probably represents some other population or that
The sample mean occurred as a result of sampling error
The key difference between parametric and nonparametric procedures is that parametric
procedures
Require certain stringent assumptions be met
What are the assumptions that are to be made when dealing with parametric procedures?
The population of the Dependent variable forms a normal distribution and the scores are of an
interval/ratio scale
Inferential statistics are used to
Decide whether sample data represent a particular relationship in the population
Which of the following assumptions is common to all Parametric statistics?
The population of dependent scores, which must be interval or ratio scores, forms a normal
distribution.
Which of the following is correct regarding experimental hypotheses?
They describe the predicted relationship we may or may not find in an experiment.
When is a two-tailed test used?
When a relationship is predicted without stating the direction in which the scores will change.
Relationship but no direction
When is a one-tailed test used?
,When a relationship is predicted and the direction in which the scores will change is predicted.
Relationship and direction
Which of the following is correct regarding Statistical hypotheses?
They describe the population parameters our sample data represent if there is or is not a predicted
relationship
Which of the following is correct regarding the alternative hypothesis?
They describe the population parameters represented by the sample data if the predicted
relationship exists.
Which of the following describes the situation if the relationship you are testing in your
experiment really exists?
The alternative hypothesis
Which of the following is true of any one-sample experiment?
We must know the population mean under some condition of the independent variable other than
the one being tested.
The null hypothesis describes the?
Population parameters represented by the sample data if the predicted relationship does not exist.
Which of the following is called the hypothesis of "no difference"
The null hypothesis
Which of the following alternative hypotheses would require a two-tail test?
Ha (alternative hypothesis): u (population mean) does not equal 100
Which hypothesis is actually being tested in statistical hypothesis testing?
The null hypothesis Ho
When can the z-test be used in statistical hypothesis testing?
When the raw score population's standard deviation is known.
, What does the null sampling distribution describe?
The sampling distribution when the null hypothesis is true.
In using a sampling distribution of means for statistical hypothesis testing, the mean of the
sampling distribution will always be equal.
To the u(mew) describe by the Ho (null hypothesis)
sample mean = population mean described by null
What does alpha always represent in statistical hypothesis testing?
The relative size of the region of rejection.
For a two-tailed test where alpha=0.05, zcrit is always equal to
negative/positive 1.96
If Xbar (sample mean)=82 u(population mean)=79 Qx(raw score of population)=15, and
N=25 what is Zobt?
1.00 because
82-79=3, then you must divide by Qx, where Qx= Qx/The square root of N. so 15/sr25 =
15/5=3....
so 3/3=1.00
If Xbar (sample mean)=34, u=37, Qx=8, and N=12, what is the value of Zobt?
-1.30
If Xbar=53, u=51, Qx=10, and N=15, what is the value of Zobt?
0.78
For Ho (null hypothesis): u=50, Ha: u does not = 50, Xbar=52, Qx=3, N=16, and alpha is
0.05, what is the appropriate outcome of a z-test?
Zcrit=+-1.96, Zobt=2.67, Reject Ho and Accept Ha... reject null accept alternative
For Ho: u is less than or equal too 76, Ha: u>76, Xbar=78, Qx=5, N=25, and alpha is 0.05,
what is the appropriate outcome of a z-test?
