1. In statistics what is a null hypothesis? 2. When the deviations are large between the observed and the expected values, what is the result for the calculated chi-square value? 3. How do you calculate the number of degrees of freedom for a chi-square test? 4 What is the typical probability cut off at which we reiect the null hypothesis?
1. In statistics what is a null hypothesis? 2. When the deviations are large between the observed and the expected values, what is the result for the calculated chi-square value? 3. How do you calculate the number of degrees of freedom for a chi-square test? 4 What is the typical probability cut off at which we reiect the null hypothesis?
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question

Transcribed Image Text:Table 2. Results of two coins tossed simultaneously 40 times.
Outcomes
(OIE)
Observed Expected
(0)
(E)
2 heads
1 head, 1 tail
2 tails
Totals
1. State a null hypothesis for this experiment.
2. How many degrees of freedom are there?
3. What is the critical value of the X² for a = 0.05?
4. Do you accept or reject the null hypothesis? Why?
Activity 3
Table 3. Results of three coins tossed simultaneously 64 times.
Outcomes
Observed Expected
(0)
(E)
(O - E)
3 heads
2 heads; 1 tail
1 heads; 2 tails
3 tails
Totals
XXXXXX
1. State a null hypothesis for this experiment.
2. How many degrees of freedom are there?
3. What is the critical value of the X² for a = 0.05?
XXXXXX
4. Do you accept or reject the null hypothesis? Why?
(OE)²
(OE)²/E
XXXXX X² =
(O.DE)²
(OE)²/E
XXXXXX X²=

Transcribed Image Text:Name
Worksheet- Probabilities and Statistics
More Review:
1. In statistics what is a null hypothesis?
2. When the deviations are large between the observed and the expected values, what is the
result for the calculated chi-square value?
3. How do you calculate the number of degrees of freedom for a chi-square test?
4. What is the typical probability cut off, at which we reject the null hypothesis?
5. What does this P value mean?
6. What is the critical X² value for 1 degree of freedom?
Activity 1
Table 1. Results of one coin tossed 20 times.
Outcomes
Observed Expected
(0)
(E)
Heads (H)
Tails (T)
Totals
(OE)
XXXXXX
(OE)² (OE)²/E
2. Why would you expect some deviations from the expected?
XXXXXX X² =
1. Do the observed results correspond exactly to the expected, or is there some variation?
3. If Activity 1 had been an experiment, what would the null hypothesis have been?
4. Do you accept or reject your null hypothesis for the data in Table 1?
Activity 2
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