A company manufactures tennis balls. When its tennis balls are dropped onto a concrete surface from a height of 100 inches, the company wants the mean height the balls bounce upward to be 54.7 inches. This average is maintained by periodically testing random samples of 25 tennis balls. If the t-value falls between - to.95 and to.95, then the company will be satisfied that it is manufacturing acceptable tennis balls. A sample of 25 balls is randomly selected and tested. The mean bounce height of the sample is 56.9 inches and the standard deviation is 0.25 inch. Assume the bounce heights are approximately normally distributed. Is the company making acceptable tennis balls? Find - to 95 and to.95. - ¹0.95 = -2.064 t-value = ... ¹0.95 = 2.064 (Round to three decimal places as needed.) Find the t-value. Ex

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### Educational Content on Statistical Testing

**Scenario:**
A company manufactures tennis balls and conducts quality checks based on bounce height. The desired mean bounce height is 56.7 inches when the balls are dropped from a height of 100 inches.

**Testing Procedure:**
The company tests random samples of 25 tennis balls to ensure the mean bounce height falls between specific limits, \( t_{0.95} \) and \(-t_{0.95} \).

- If the bounce height falls within these limits, the company is satisfied with the quality of the tennis balls.

**Sample Findings:**
A sample of 25 tennis balls is randomly selected, producing a mean bounce height of 56.9 inches. The standard deviation for this sample is 0.25 inches.

**Statistical Assumptions:**
- The bounce heights are assumed to be approximately normally distributed.

**Statistical Task:**

1. **Find \( -t_{0.95} \) and \( t_{0.95} \):**

   - \( -t_{0.95} = -2.064 \)
   - \( t_{0.95} = 2.064 \)

2. **Calculation Steps:**
   - Round to three decimal places as needed to find the t-value.

**Conclusion:**
These limits help determine if the production process is within acceptable boundaries for the desired bounce height of tennis balls.
Transcribed Image Text:### Educational Content on Statistical Testing **Scenario:** A company manufactures tennis balls and conducts quality checks based on bounce height. The desired mean bounce height is 56.7 inches when the balls are dropped from a height of 100 inches. **Testing Procedure:** The company tests random samples of 25 tennis balls to ensure the mean bounce height falls between specific limits, \( t_{0.95} \) and \(-t_{0.95} \). - If the bounce height falls within these limits, the company is satisfied with the quality of the tennis balls. **Sample Findings:** A sample of 25 tennis balls is randomly selected, producing a mean bounce height of 56.9 inches. The standard deviation for this sample is 0.25 inches. **Statistical Assumptions:** - The bounce heights are assumed to be approximately normally distributed. **Statistical Task:** 1. **Find \( -t_{0.95} \) and \( t_{0.95} \):** - \( -t_{0.95} = -2.064 \) - \( t_{0.95} = 2.064 \) 2. **Calculation Steps:** - Round to three decimal places as needed to find the t-value. **Conclusion:** These limits help determine if the production process is within acceptable boundaries for the desired bounce height of tennis balls.
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