A marketing firm randomly visited several gasoline stations to collect a sample of their gasoline. Each sample was measured for its octane rating and theresults shown in the histogram below. If a single sample is selected at random, what is the probability its octane rating will be 93 or higher?4035302520151081848790939699102Octane Rating

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Answered: A marketing firm randomly visited…

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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Use the following data to calculate the expected frequencies for each category. Type fo fe A 190 B 320 C 215 D 325 Total
Are mothers having their first child at an older age? The average age of a random sample of 36 mothers who had their first child before the year 2000 or before and the average age of a random sample of 39 mothers who had their first child after the year 2000 is summarized in the table below. 2000 or Before: x=23.393 , s=3.938 2000 or Before: x=25.121 , s=4.904 Are mothers after the year 2000 having their first child at an older age compared to the years 2000 and prior? Use a significance level of 0.10. hypothesis test is needed
Each year, researchers at the U.S. Bureau of Labor Statistics (BLS) administer the American Time Use Survey (ATUS). Researchers estimate the average amount of time Americans spend on daily activities, such as working, housework, and leisure activities. In particular, one activity that is of interest is the average amount of time Americans spend watching television each day. A researcher complied a random sample of 12 Americans and asked each person how much time they spent watching television each day. The results are given below. 2.7 2.3 3.4 0.6 4.8 1.8 3.7 4.8 1.8 4.6 4.2 1.6 Determine the point estimate, x¯ and the sample standard deviation, s. Round the solutions to four decimal places, if necessary. xwith the - on top of x = s= Using a 98% confidence level, determine the margin of error, E, and a confidence interval for the average time Americans spend watching television each day. Report the confidence interval using interval notation. Round solutions to two decimal…
A travel agency plans to develop a new ad campaign to entice visitors to come to the Treasure Coast. As a part of the new campaign, the agency would like to advertise the warm ocean water along the Treasure Coast but would like to do so accurately. They hire a statistics student to record the water temperature on a randomly selected sample of 10 days. The water temperature of each day is recorded below. 74.1 85.1 77.3 68.8 70.4 76.1 81.7 79.9 70.3 83.1 Using a 98% confidence level, determine a confidence interval for the average water temperature along the Treasure Coast. O (71.6°, 81.8°) O (74.2°, 79.2°) O (68°, 85.4°) O (70.8°, 82.6°) > Next Question
In the world population, 81.2% of all people have dark brown or black hair, 10.3% have brown hair, 6.3% have blond hair and 2.2% have red, gray, or white hair. A researcher wants to see if the distribution of hair color is different for the residents of Nashville. The table below shows the results of a random sample of 568 residents in Nashville. What can be concluded at the significant level of a = 0.01.
Bighorn sheep are found in the mountainous western United States. In the following data, x = the age of bighorn sheep in years and y = the percentage of that age group that die during the course of a year (mortality rate). In the table below, when x = 5, y = 20 meaning that 20% of the sheep aged between 5 and 6 years old die. A random sample of sheep provided the following information: x 1 2 3 4 5 y 14 18.9 14.4 19.6 20 ∑ x = 15 ; ∑ y = 86.9 ; ∑ x 2 = 55 ; ∑ y 2 = 1544.73 ; ∑ x y = 273.4 Find Sxx
A survey of students in a large introductory statistics class asked about their birth order (1 = oldest or only child) and which college of the university they were enrolled in. To the right is a table showing the results. Suppose a student is selected at random from this class. Complete parts a through d below. Birth Order College Arts & Sciences Agriculture Human Ecology Other Total 1 or Only 2 or More 24 Total 25 49 53 18 33 29 10 96 86 47 24 S 14 110 206 2 a) What is the probability that the person is a Human Ecology student? 3 (Round to three decimal places as needed.) b) What is the probability that the person is a firstborn student? Ani (Round to three decimal places as needed.) Pas c) What is the probability that the person is firstborn and a Human Ecology student? Cul (Round to three decimal places as needed.) d) What is the probability that the person is firstborn or a Human Ecology student? (Round to three decimal places as needed.)
Suppose a random sample of 1156 adults from your town are surveyed. The table below shows the results of the survey. Observed Frequencies Job Types the Sample Observed Frequency Outcome Blue Collar 277 White Collar 381 Pink Collar 417 Unemployed 81 The job type distribution for the entire state are summarized in second column of the table below. Fill in the expected frequencies. Frequencies of Job Types in the State Expected Percent Outcome Expected Frequency Blue Collar 23 White Collar 27 Pink Collar 43 Unemployed 7.
It is a 2 part question. How can we find normality?
Each year, researchers at the U.S. Bureau of Labor Statistics (BLS) administer the American Time Use Survey (ATUS). Researchers estimate the average amount of time Americans spend on daily activities, such as working, housework, and leisure activities. In particular, one activity that is of interest is the average amount of time Americans spend watching television each day A researcher complied a random sample of 14 Americans and asked each person how much time they spent watching television each day. The results are given below. 2.11.3 0.9 3.3 2.3 1 4 2 3.1 0.8 4.4 1.5 2.2 3 Determine the point estimate , and the sample sadard deviation , Round the solutions to four decimal overline x places , if necessary . overline x = Box; s = Using a 98% confidence level , determine the margin of error, E, and a confidence interval for the average time Americans spend watching television each dayReport the confidence interval using interval notation Round solutions to two decimal places , if…
Bighorn sheep are found in the mountainous western United States. In the following data, x = the age of bighorn sheep in years and y = the percentage of that age group that die during the course of a year (mortality rate). In the table below, when x = 5, y = 20 meaning that 20% of the sheep aged between 5 and 6 years old die. A random sample of sheep provided the following information: x 1 2 3 4 5 y 14 18.9 14.4 19.6 20 ∑ x = 15 ; ∑ y = 86.9 ; ∑ x 2 = 55 ; ∑ y 2 = 1544.73 ; ∑ x y = 273.4 find m for this data
The number of cancer cases by smoking status is shown in below table is a sample of randomly selected individuals. These figures will give an odds ratio of: Smoking status Smoker Non-smoker Lung cancer With cancer Without cancer 40 25 20 20 50

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