Psychology 300 'Null Hypothesis'

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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