Example 1
In regards to
probability, what is the additive rule? Provide an example. Given a set of
mutually exclusive events, the probability of the occurrence of one
event or another is equal to the sum of their separate probabilities.
What is the probability of a randomly choosing student at Tech having a compact car (A), or an SUV (B), P(A) = .6, P(B) = .3P(A or B) = .6 + .3 = .9
In terms of probability, what is
the multiplicative rule? Provide an example. The probability of
the joint occurrence of two or more independent events is the product
of their individual probabilities.
Suppose we have a bag of coins: 30 quarters, 15 dimes, and 55 nickels.P (quarters) = .30P (dimes) = .15P (nickels) = .55
The
probability that we draw a quarter on the first trial and a quarter
on the second trial:
.30 X .30 = .09
The
probability that we draw a quarter on the first trial and a dime on
the second trial:
30 X .15 = .04
Regarding the normal curve, what
percentage of the population will fall between +1 and -1 standard
deviations? What percentage will fall between +2 and -2 standard
deviations? 68% of the pop will
fall in the +1 and -1 range 96% of the pop will
fall between +1 and -1
What is the difference between the
Null hypothesis (H0) and the Research hypothesis
(HA)? Provide examples of both. A null hypothesis
is a hypothesis
that may be falsified using a test of observed data, where as a
research hypothesis is a statement created
by a researcher when they speculate upon the outcome of a research or
experiment.
What is the difference between
Nominal and Ordinal data? Please provide examples of both. (I know I
said no more question about this stuff until the midterm, but
someone got them mixed up on the paper assignment) Nominal Data is the values of the scale
have no 'numeric' meaning in the way that you usually think about numbers. People or objects with the same scale value are the same on
some attribute. Categorical label; Example: Male/Female. Ordinal Data is measured in
first second or last, but the ranks do not add any other additional
information about the ranking. Example: placing first, second, or
third in a race
Example 2
|
Statistical Decision
|
True State of the Null Hypothesis
|
|
|
|
H0 True
|
H0 False
|
|
Reject H0
|
1
|
2
|
|
Do not Reject H0
|
3
|
4
|
According to the table above, what
does BOX 1 represent? B. Type I Error
H0 True, Reject H0
a. Correct Decision
b. Type I Error
c. Type II Error
d. None of the above
According to the table above, what
does BOX 3 represent? A. Correct Decision
H0 True, Do not Reject H0
a. Correct Decision
b. Type I Error
c. Type II Error
d. None of the above
According to the table above, what
does BOX 2 represent? A. Correct Decision
H0 False, Reject H0
a. Correct Decision
b. Type I Error
c. Type II Error
d. None of the above
According to the table above, what
does BOX 4 represent? C. Type II Error
H0 False, Do not Reject H0
a. Correct Decision
b. Type I Error
c. Type II Error
d. None of the above
Example 3
When should you use an ANOVA
(F-test)? Use ANOVA to
analyze variance. There must be more than 2 groups, more than one
dependent variable, and either interval or ratio data. When should you use a t-test? Use a t-test if
you are trying to find out if the variance between groups is
significant. It is looking for differences. There must be 2 groups
and the data must be interval or ratio.
When should you use a correlation? Correlation is
used to find relationships amongst groups. What is the difference between an
independent and dependent variable? An independent
variable is the variable which researches have control over and can
manipulate to affect the dependent variable. The dependent variable
is being measured and is affected by the independent variable.
What is your favorite statistical
test? My favorite
statistical test is the t-test because if someone had a stutter you
couldn’t tell if they were talking about just a regular test or a
t-test
Final Note:
Please use your book, notes, and any other resource you choose to answer the following questions. Please read the questions carefully and answer them completely.
Please remember to put your name on your quiz. After you have completed the quiz, please submit it via the digital dropbox on blackboard. To access the digital dropbox, log in to your blackboard account.
Next select PSYC-300 002. On the left of your screen, just under external links, select tools. Next select the third option down, digital dropbox. From there select add file and add your quiz. BE SURE TO THEN CLICK “SEND FILE.” If you do not send your file, I will not be able to score your quiz. If you have any questions please feel free to email me. Best of luck.
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