A pediatrician wants to determine the relation that may exist between a child's height and head circumference. She randomly selects 8 children from her practice, measures their height and head circumference, and obtains the data shown in the table. Complete parts (a) through (e) below. O Click here to see the Table of Critical Values for Correlation Coefficient. Height (in.) Head Circumference (in.) - 27.5 25.5 26 25 25 25 17.2 17 27.5 26.25 25.75 26.75 17.1 17 17.6 17.4 17.1 17.4 (c) Compute the linear correlation coefficient between the height and head circumference of a child. (Round to three decimal places as needed.)

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**Critical Values for Correlation Coefficient**

This chart displays the critical values for correlation coefficients at different sample sizes, denoted by \( n \).

| \( n \)  | Critical Value |
|-------|----------------|
| 3     | 0.997          |
| 4     | 0.950          |
| 5     | 0.878          |
| 6     | 0.811          |
| 7     | 0.754          |
| 8     | 0.707          |
| 9     | 0.666          |
| 10    | 0.632          |
| 11    | 0.602          |
| 12    | 0.576          |
| 13    | 0.553          |
| 14    | 0.532          |
| 15    | 0.514          |
| 16    | 0.497          |
| 17    | 0.482          |
| 18    | 0.468          |
| 19    | 0.456          |
| 20    | 0.444          |
| 21    | 0.433          |
| 22    | 0.423          |
| 23    | 0.413          |
| 24    | 0.404          |
| 25    | 0.396          |
| 26    | 0.388          |
| 27    | 0.381          |
| 28    | 0.374          |
| 29    | 0.367          |
| 30    | 0.361          |

These values are used to determine the significance of a correlation at various sample sizes. A high critical value indicates that a strong correlation is needed to achieve significance at smaller sample sizes, while a lower value suffices for larger samples.
Transcribed Image Text:**Critical Values for Correlation Coefficient** This chart displays the critical values for correlation coefficients at different sample sizes, denoted by \( n \). | \( n \) | Critical Value | |-------|----------------| | 3 | 0.997 | | 4 | 0.950 | | 5 | 0.878 | | 6 | 0.811 | | 7 | 0.754 | | 8 | 0.707 | | 9 | 0.666 | | 10 | 0.632 | | 11 | 0.602 | | 12 | 0.576 | | 13 | 0.553 | | 14 | 0.532 | | 15 | 0.514 | | 16 | 0.497 | | 17 | 0.482 | | 18 | 0.468 | | 19 | 0.456 | | 20 | 0.444 | | 21 | 0.433 | | 22 | 0.423 | | 23 | 0.413 | | 24 | 0.404 | | 25 | 0.396 | | 26 | 0.388 | | 27 | 0.381 | | 28 | 0.374 | | 29 | 0.367 | | 30 | 0.361 | These values are used to determine the significance of a correlation at various sample sizes. A high critical value indicates that a strong correlation is needed to achieve significance at smaller sample sizes, while a lower value suffices for larger samples.
**Exploring Correlation Between Height and Head Circumference in Children**

A pediatrician seeks to understand the potential relationship between a child's height and head circumference. A sample of 8 children is randomly selected, and their respective heights and head circumferences are measured. The findings are presented in the following table:

| Height (in.) | Head Circumference (in.) |
|--------------|--------------------------|
| 27.5         | 17.2                     |
| 25.5         | 17                       |
| 26.25        | 17.1                     |
| 25.25        | 17                       |
| 27.5         | 17.6                     |
| 26.25        | 17.4                     |
| 25.75        | 17.1                     |
| 26.75        | 17.4                     |

**Task (c):** Compute the linear correlation coefficient between height and head circumference.

- **r = ____**
- *(Round to three decimal places as needed.)*
Transcribed Image Text:**Exploring Correlation Between Height and Head Circumference in Children** A pediatrician seeks to understand the potential relationship between a child's height and head circumference. A sample of 8 children is randomly selected, and their respective heights and head circumferences are measured. The findings are presented in the following table: | Height (in.) | Head Circumference (in.) | |--------------|--------------------------| | 27.5 | 17.2 | | 25.5 | 17 | | 26.25 | 17.1 | | 25.25 | 17 | | 27.5 | 17.6 | | 26.25 | 17.4 | | 25.75 | 17.1 | | 26.75 | 17.4 | **Task (c):** Compute the linear correlation coefficient between height and head circumference. - **r = ____** - *(Round to three decimal places as needed.)*
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