Answered: A statistics firm obtains a list of all…

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.4: Distributions Of Data

Problem 19PFA

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A statistics firm obtains a list of all cars in the U.S. that are registered with state DMV offices and
randomly selects 81 cars from the list. For this sample, the average weight is found to be 2919 pounds
with a standard deviation of 540 pounds.The weight of cars can be assumed to be normal.
a) Calculate the 90% confidence interval for the parameter of interest and interpret it.
b) Comment on the following interpretations for the confidence interval:
i) 90% of all currently licensed registered vehicles weigh between 2819.1 and 3018.9 pounds.
ii) The mean weight of all the currently registered vehicles is between 2819.1 and 3018.9 pounds
90% of the time.

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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