In a random sample of 21 people, the mean commute time to work was 33.2 minutes and the standard deviation was 7.1 minutes. Assume the population is normally distributed and use a t-distribution to construct a 80% confidence interval for the population mean . What is the margin of error of ? Interpret the results. In a random sample of 21 people, the mean commute time to work was 33.2 minutes with a standard deviation of 7.1 minutes. Assume the population is normally distributed and use a t-distribution to construct an 80% confidence interval for the population mean μ. What is the margin of error of μ? Interpret the results.The confidence interval for the population mean μ is \( [\ \ ] \).(Round to one decimal place as needed.)The margin of error of μ is \( [\ \ ] \).(Round to one decimal place as needed.)**Interpret the results:**- **A.** With 80% confidence, it can be said that the commute time is between the bounds of the confidence interval.- **B.** With 80% confidence, it can be said that the population mean commute time is between the bounds of the confidence interval.- **C.** It can be said that 80% of people have a commute time between the bounds of the confidence interval.- **D.** If a large sample of people are taken, approximately 80% of them will have commute times between the bounds of the confidence interval.

The sample size, i.e., the sampled number of people, n=21.The sample mean commute time (in minutes),…

Answered: In a random sample of 21 people, the…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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In a random sample of 21 people, the mean commute time to work was 33.2 minutes and the standard deviation was 7.1 minutes. Assume the population is normally distributed and use a t-distribution to construct a 80% confidence interval for the population mean . What is the margin of error of ? Interpret the results.

In a random sample of 21 people, the mean commute time to work was 33.2 minutes with a standard deviation of 7.1 minutes. Assume the population is normally distributed and use a t-distribution to construct an 80% confidence interval for the population mean μ. What is the margin of error of μ? Interpret the results.

The confidence interval for the population mean μ is \( [\ \ ] \).
(Round to one decimal place as needed.)

The margin of error of μ is \( [\ \ ] \).
(Round to one decimal place as needed.)

**Interpret the results:**

- **A.** With 80% confidence, it can be said that the commute time is between the bounds of the confidence interval.
- **B.** With 80% confidence, it can be said that the population mean commute time is between the bounds of the confidence interval.
- **C.** It can be said that 80% of people have a commute time between the bounds of the confidence interval.
- **D.** If a large sample of people are taken, approximately 80% of them will have commute times between the bounds of the confidence interval.

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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