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The one-way commuting times from home to work for all employees working at a large company have a mean of 34 minutes and a standard deviation of 8 minutes. a. Using Chebyshev's theorem, find the minimum percentage of employees at this company who have one-way commuting times in the following intervals. i. 14 to 54 minutes ii. 18 to 50 minutes 'b. Using Chebyshev's theorem, find the interval that contains one-way commuting times of at least \(89 \%\) of the employees at this company.

Short Answer

Expert verified
For part (a), the minimum percentage of employees having commuting times within the interval of 14 to 54 minutes is 84%, and within the interval of 18 to 50 minutes is 75%. For part (b), the interval that contains one-way commuting times of at least 89% of the employees at this company is approximately 7 minutes to 61 minutes.

Step by step solution

01

Applying Chebyshev's theorem to calculate intervals

For part (a), we can apply Chebyshev's theorem to the given intervals. i. For the interval 14 to 54 minutes, the number of standard deviations away from the mean (k) is calculated as follows: \(k = (Mean - Lower limit) / standard deviation = (34 - 14) / 8 = 2.5\) ii. For the interval 18 to 50 minutes, the calculation is similar: \(k = (Mean - Lower limit) / standard deviation = (34 - 18) / 8 = 2\)
02

Apply Chebyshev's theorem again to find minimum percentage

After finding k, we can apply Chebyshev's theorem again to find the minimum percentage of the data within these intervals. i. For 2.5 standard deviations away from the mean: \(1 - 1/k^2 = 1 - 1/(2.5)^2 = 0.84\) or 84% ii. For 2 standard deviations away from the mean: \(1 - 1/k^2 = 1 - 1/(2)^2 = 0.75\) or 75%
03

Use Chebyshev’s theorem to find the interval

For part (b), we are asked to find the interval that contains commuting times of at least 89% of the employees. We are thus looking for the value of k where \(1 - 1/k^2 >= 0.89\). Solving the inequality, we get \(k >= 3.33\). Therefore, the interval that contains one-way commuting times of at least 89% of the employees at this company is \(Mean - k * standard deviation\) to \(Mean + k * standard deviation\), or \(34 - 3.33 * 8\) to \(34 + 3.33 * 8\), which is approximately 7 minutes to 61 minutes.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Commuting Times
Understanding commuting times helps in evaluating how long employees take to travel from home to work. This is important for organizational planning and understanding employee work-life balance. In our example, the mean commuting time is 34 minutes. This average gives us a baseline understanding of typical travel times experienced by employees.

When analyzing commuting times, it's crucial to consider variability. The range of commuting times can impact productivity and employee satisfaction. Some employees may have shorter commutes, while others may experience longer journeys. By examining data such as means and employing statistical tools like Chebyshev's Theorem, businesses can gain insights into their employees' commuting patterns.
Mean and Standard Deviation
The mean and standard deviation are key statistical concepts that help us understand data distribution. The mean is the average of a data set, a simple calculation where all values are summed and then divided by the count of values. For the commuting example, the mean is 34 minutes, indicating that employees typically take this amount of time on average to commute one way.

Standard deviation, on the other hand, measures the spread or dispersion of a data set. It indicates how much individual data points differ from the mean. In our scenario, a standard deviation of 8 minutes suggests there is some variability in commuting times. Some employees will deviate from the mean by a few minutes, and understanding this spread can help organizations cater to employees' needs intelligently.
Interval Estimation
Interval estimation provides a range within which we expect a certain percentage of the data to lie. With Chebyshev’s Theorem, we can estimate the probability that a random variable falls within a certain number of standard deviations from the mean. This theorem is particularly helpful when the distribution of the data is unknown.
  • For the interval within 14 to 54 minutes, the calculated 'k' value is 2.5 standard deviations. According to Chebyshev’s Theorem,
  • For an interval from 18 to 50 minutes, this shrinks to 2 standard deviations from the mean.
This information gives managers insights into the variability of commuting times and helps them make informed decisions.
Probability Theory
Probability theory plays a significant role in predicting outcomes and understanding the likelihood of various events occurring. Chebyshev's Theorem is a probabilistic tool that states irrespective of the shape of the distribution, the proportion of values within 'k' standard deviations of the mean is at least \(1 - \frac{1}{k^2}\).

This theorem allows us to make definitive statements about data distributions even when the exact distribution is unknown. For instance, it helped determine that at least 84% of employees commute between 14 to 54 minutes and at least 75% commute between 18 to 50 minutes. More importantly, it highlighted that approximately 89% of commuting times fall between 7 to 61 minutes.

By using probability theory and tools like Chebyshev’s Theorem, companies can better understand and address the commuting patterns of their workforce, thus driving productivity and job satisfaction.

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Most popular questions from this chapter

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Explain how the value of the median is determined for a data set that contains an odd number of observations and for a data set that contains an even number of observations.

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