A magazine published a study on the ammonia levels near the exit ramp of a highway tunnel. The data in the table below represent daily ammonia concentrations (in parts per million) on eight randomly selected days during the afternoon drive time. Complete parts a through c. 1.54 1.51 1.37 1.52 1.55 1.44 1.43 1.47 a. Find the range of the ammonia levels. Give the units of measurement for the range. The range is (Type an integer or a decimal.) b. Find the variance of the ammonia levels. If possible, give the units of measurement for the variance. The variance is with (Round to four decimal places as needed.) c. Find the standard deviation of the ammonia levels. Give the units of measurement for the standard deviation. The standard deviation is (Round to three decimal places as needed.)
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
A magazine published a study on the ammonia levels near the exit ramp of a highway tunnel. The data in the table below represent daily ammonia concentrations (in parts per million) on eight randomly selected days during the afternoon drive time. Complete parts a through
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**Study on Ammonia Levels near Highway Tunnel**
A magazine conducted a study on the ammonia levels found near the exit ramp of a highway tunnel. The data in the table below represents the daily ammonia concentrations (in parts per million) on eight randomly selected days during the afternoon drive time. Please complete parts (a) through (c) based on the provided data.
**Data Table (Ammonia Levels in parts per million):**
- 1.54
- 1.51
- 1.37
- 1.52
- 1.55
- 1.44
- 1.43
- 1.47
### a. Calculate the Range of Ammonia Levels
**Instruction:** Find the range of the ammonia levels and provide the units of measurement for the range.
**Range Calculation:**
- **The range is**: [Input Field] [Drop-down for Units]
*(Type an integer or a decimal.)*
### b. Calculate the Variance of Ammonia Levels
**Instruction:** Find the variance of the ammonia levels. If possible, provide the units of measurement for the variance.
**Variance Calculation:**
- **The variance is**: [Input Field] [Drop-down for Units]
*(Round to four decimal places as needed.)*
### c. Calculate the Standard Deviation of Ammonia Levels
**Instruction:** Find the standard deviation of the ammonia levels and provide the units of measurement for the standard deviation.
**Standard Deviation Calculation:**
- **The standard deviation is**: [Input Field] [Drop-down for Units]
*(Round to three decimal places as needed.)*
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