See attached image for question: 18.42 This Wine Stinks. How sensitiveare the untrained noses of students?Exercise 16.27 (page 381) gives the low-est levels of dimethyl sulfide (DMS) that10 students could detect. You want toestimate the mean DMS odor thresholdamong all students, and you would besatisfied to estimate the mean to within±0.1 with 99% confidence. The standarddeviation of the odor threshold foruntrained noses is known to be o = 7micrograms per liter of wine. How largean SRS of untrained students do youneed?

The simple random sample size formula is defined as follows, when population standard deviation (σ)…

Answered: 18.42 This Wine Stinks. How sensitive…

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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At a water bottling facility, a technician is testing a bottle filling machine that is supposed to deliver 500 ml of water, and in the past the standard deviation of the population of bottles has be 7.5 ml. The technician dispenses 39 samples of water and determines the volumes have a mean of 498.3 ml. The technician wants to perform a hypothesis test at (alpha) = 0.05 level to determine whether the machine is not dispensing 500 ml, and is thus out of calibration. Hypothesis Statement: Test Value(s): So, we ____ the null hypothesis because ______. There ______ enough evidence to support the claim that the machine mean volume differs from 500 ml and is out of calibration.
The median pH level of the rain in a certain county, was 4.90. A biologist obtains a random sample of 19 rain dates and obtains the following data. Test the hypothesis that the median pH level has decreased from 4.90 at the alpha= 0.05 level of significance.
The average weight of a package of rolled oats is supposed to be at least 18 ounces. A sample of 18 packages shows a mean of 17.78 ounces with a standard deviation of 0.41. At alpha/a = .05, what is the null hypothesis?
The NAEP considers that a national average of 283 is an acceptable performance. Using α = .05, run a two-tail t-test for one sample to test Ho: µ=283 for the 2019 scores. Report the t-obt, df, and p-values. Would you reject the null hypothesis that the 2019 scores come from a population with average 283? If this is the case, does it come from a population from larger or smaller average?
) A network provider investigated t he number of blocked intrusions to its network, and found that there were, on average, 45 blocked intr usions per day. After a change in firewall settings, the mean number of intrusions during the nex t 35 days was 42 with a standard deviation equal to 15.5. Perform a hypothesis test to determin e if the change in firewall settings reduced the number of intru sion
The average wind speed in Casper Wyoming has been found to 12.7 miles per hour and in Phoenix Arizona it is 6.2 mph. To test the relationship between the averages, the average wind speed has calculated for a sample of 31 days for each city. The results are reported below. Is there sufficient evidence at alpha = 0.05 to conclude that the average wind speed is greater in Casper or Phoenix ? Sample size Casper 31 Phoneix 31 Sample mean 12.85mph 7.9mph Sample standard deviation 3.3mph 2.8mph
A random sample of 50 COS students contained 13 that owned an iPhone. A random sample of 200 Fresno State students contained 70 that owned an iPhone. Use these data to test the claim that the proportion of COS students who own an iPhone is the same as the proportion of Fresno State students who own an iPhone at the 0.05 level of significance.
A nationwide study of undergraduate students reported that the mean number of drinks consumed per week during the spring semester is 7.96. The mean number of drinks consumed per week at USC is 7.64 (s.d.=2.55, N=412 Health services is concerned that USC students are consuming significantly more alcohol per week than the national average. Using an alpha level of .05, Is there sufficient evidence to be concerned? Be sure to select the correct critical value for the alternative hypothesis, and then use this evidence to make your conclusion
A electronics manufacturer has developed a new type of remote control button that is designed to operate longer before failing to work consistently. A random sample of 19 of the new buttons is selected and each is tested in continuous operation until it fails to work consistently. The resulting lifetimes are found to have a sample mean of ?¯x¯ = 1268.3 hours and a sample standard deviation of s = 107.7. Independent tests reveal that the mean lifetime of the best remote control button on the market is 1205 hours. Conduct a hypothesis test to determine if the new button's mean lifetime exceeds 1205 hours. Round all calculated answers to four decimal places.
Ackerman and Goldsmite found that students who studed tesxt from printed hardcopy had better test scores than students who studied from text presented on a screen. In a related study, a professor noticed that several students in a large class had purchased the e-book version of the course textbook. For the final exm, the overall average for the entire class was μ = 81.7 but the n = 9 students who used e-books had a mean of M = 72.2 with a standard deviation of s = 5.7 a. is the sample sufficient to condluce that scores for students using e-books were significantly different from scores for the regular class? use a two-tailed test with alpha = .05 b. Construct the 90% confidence interval to estimate the mean exam score if the entire population used e-books
In a study examining overweight and obese college football players, Mathews and Wagner(2008) found that on average both offensive and defensive linemen exceeded the at-risk criterionfor body mass index (BMI). BMI is a ratio of body weight to height squared and is commonlyused to classify people as overweight or obese. Any value greater than 30 kg/m2 is considered tobe at risk. In the study, a sample of n = 17 offensive linemen averaged M = 34.4 with a standarddeviation of s = 4.0. A sample of n = 19 defensive linemen averaged M = 31.9 with s = 3.5a. Use a single-sample t test to determine whether the offensive linemen are significantly abovethe at-risk criterion for BMI. Use a one-tailed test with α = .01.b. Use a single-sample t test to determine whether the defensive linemen are significantly abovethe at-risk criterion for BMI. Use a one-tailed test with α = .01.c. Use an independent-measures t test to determine whether there is a significant differencebetween the offensive linemen…
The average expenditure per student (based on average daily attendance) for a certain school year was $10,337 with a population standard deviation of $1560. A survey for the next school year of 150 randomly selected students resulted in a sample mean of $10, 798. Find the P-value? Should the null hypothesis be rejected at alpha = .05 level of significance?

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