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16 Dec 2021
Given information
Use the following information to answer the next five exercises: A teacher predicts that the distribution of grades on the final exam will be and they are recorded in Table 
.
The actual distribution for a class of 
is in Table 
.
At the 
significance level, what can you conclude?
Step-by-step explanation
Step 1.
Know that the overall frequency here is 
. As a result, we multiply each frequency by and arrive at the table below,
| Grade | Proportion | Expected Frequency |
| A | 0.25 |  |
| B | 0.30 |  |
| C | 0.35 |  |
| D | 0.10 |  |
Calculate 
we will follow the following steps:
- In the first column of the excel sheet, we enter the expected frequencies.
- Fill in the first column of the excel sheet with the observed frequencies.
- Create a column with the heading (Observed – Expected).
- Calculate the square of (Observed – Expected) in a new column.
- Divide the square of (Observed – Predicted) by the expected frequencies of each observation in the final column.
- Finally, we add the last two columns together.
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Introductory Statistics
OER Edition, 2013
Openstax
ISBN: 9781938168208
Solutions
Chapter
Section
- Problem 1
- Problem 2
- Problem 3
- Problem 4
- Problem 5
- Problem 6
- Problem 7
- Problem 8
- Problem 9
- Problem 10
- Problem 11
- Problem 12
- Problem 12a
- Problem 13
- Problem 13
- Problem 14
- Problem 15
- Problem 16
- Problem 17
- Problem 18
- Problem 19
- Problem 20
- Problem 21
- Problem 22
- Problem 23
- Problem 24
- Problem 25
- Problem 26
- Problem 27
- Problem 28
- Problem 29
- Problem 30
- Problem 31
- Problem 32
- Problem 33
- Problem 34
- Problem 35
- Problem 36
- Problem 37
- Problem 38
- Problem 39
- Problem 40
- Problem 41a
- Problem 41b
- Problem 41c
- Problem 42a
- Problem 42b
- Problem 42c
- Problem 43
- Problem 44
- Problem 45
- Problem 46
- Problem 47
- Problem 48
- Problem 49
- Problem 50
- Problem 51
- Problem 52
- Problem 53
- Problem 54
- Problem 55
- Problem 56
- Problem 57
- Problem 58
- Problem 59
- Problem 60
- Problem 61
- Problem 62
- Problem 63
- Problem 64
- Problem 65
- Problem 66
- Problem 67
- Problem 68