Textbook ExpertVerified Tutor
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.
Unlock all Textbook Solutions
Already have an account? Log in