In order to determine the average weight of carry-on luggage by passengers in airplanes, asample of 47 pieces of carry-on luggage was weighed. The average weight was 32 pounds.Assume that we know the standard deviation of the population to be 3 pounds. Also, assumethe population is normally distributed.a.b.Determine an 80% confidence interval estimate for the population mean weight of thecarry-on luggage.Determine a 95% confidence interval estimate for the population mean weight of thecarry-on luggage.

Answered: In order to determine the average…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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According to the American Red Cross, 8% of all Connecticut residents have Type B blood. A random sample of 25 Connecticut residents is taken.X=the number of CT residents that have Type B blood, of the 25 sampled.What is the standard deviation of the random variable X?
The mean number of travel days per year for salespeople employed by three hardware distributors needs to be estimated with a 0.90 degree of confidence. For a small pilot study, the mean was 150 days and the standard deviation was 16 days. If the population mean is estimated within two days, how many salespeople should be sampled? 174 616 673 2756
Use the Empirical Rule. The mean speed of a sample of vehicles along a stretch of highway is 71 miles per hour, with a standard deviation of 3 miles per hour. Estimate the percent of vehicles whose speeds are between 62 miles per hour and 80 miles per hour. (Assume the data set has a bell-shaped distribution.) Approximately % of vehicles travel between 62 miles per hour and 80 miles per hour.
At a large university, data were collected on the number of sisters and brothers that each student had. Let therandom variable X represent the number of sisters and the random variable Y represent the number ofbrothers. The distribution of X has mean 1.00 and standard deviation 0.94. The distribution of Y has mean1.07 and standard deviation 1.04. What is the mean of the distribution of X+Y? WHAT IS THE CORRECT ANSWER A. 1.98 B. 2.01 C. 2.04 D. 2.0528 E. 2.07
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Do you prefer taking tests on paper or online? A college instructor gave identical tests to two randomly sampled groups of 50 students. One group took the test on paper and the other took it online. Those who took the test on paper had an average score of 68.4 with a standard deviation of 12.1. Those who took the test online had an average score of 71.3 with a standard deviation of 14.2. Can you conclude that the mean scores differ between online and paper tests?
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Two estimates are available for the same population parameter. Estimate one has a standard deviation of 8.5 and estimate two has a standard deviation of 8.7. Estimate two is unbiased, whereas estimate one is biased. Which estimate would you choose and why?
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Compute for the mean (??̅) and standard deviation (??̅) of the sampling distribution of the sample means and compare these to the mean and standard deviation of the population.
A particular fruit's weights are normally distributed, with a mean of 790 grams and a standard deviation of 26 grams.The heaviest 6% of fruits weigh more than how many grams?

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