Assume that Friday morning taxi-cab rides have times with a standard deviation of a = 9.8 minutes. A cab driver recordstimes of rides during a Friday afternoon time period and obtains these statistics: n = 13, x= 17.7 minutes, s = 12.2minutes. Use a 0.01 significance level to test the claim that these Friday afternoon times have greater variation than theFriday morning times. Assume that the sample is a simple random sample selected from a normally distributedpopulation.Let o denote the population standard deviation of Friday afternoon cab-ride times. Identify the null and alternativehypotheses.Ho: o = 9.8H₁:o >9.8(Type integers or decimals. Do not round.)Identify the test statistic.(Round to two decimal places as needed.)w an example Get more help -Clear allCheck answerInco

The claim is that these Friday afternoon times have greater variation that the Friday morning times.…

Answered: Assume that Friday morning taxi-cab…

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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The data table contains waiting times of customers at a bank, where customers enter a single waiting line that feeds three teller windows. Test the claim that the standard deviation of waiting times is less than 1.8 minutes, which is the standard deviation of waiting times at the same bank when separate waiting lines are used at each teller window. Use a significance level of 0.05. Assume that the sample is a simple random sample selected from a normally distributed population. Complete parts (a) through (d) below. Click on the icon to view the data. a. Identify the null and alternative hypotheses. Choose the correct answer below. OA. H: 18 minutes HA:a=1.8 minutes OC. Ho: 1.8 minutes HA: <1.8 minutes b. Compute the test statistic. 2-0 (Round to two decimal places as needed.) c. Find the P-value of the test statistic OB. H: 21.8 minutes HA: <1.8 minutes OD. H: 1.8 minutes HA: #1.8 minutes The P-value of the test statistic is (Round to three decimal places as needed.) d. Does the use of…
Assume the failure rate for drivers road tests in Vancouver is normally distributed. On average 0.33 (33%) of drivers fail their drivers road test in Vancouver and the standard deviation of failing road tests is 0.024 (2.4%). What is the chance that less than 0.29 (29%) of drivers fail their road test?
Assume that Friday morning taxi-cab rides have times with a standard deviation of a = 10.1 minutes. A cab driver records times of rides during a Friday afternoon time period and obtains these statistics: n=14, x= 19.8 minutes, s= 12.6 minutes. Use a 0.10 significance level to test the claim that these Friday afternoon times have greater variation than the Friday morning times. Assume that the sample is a simple random sample selected from a normally distributed population.
A college entrance exam company determined that a score of 24 on the mathematics portion of the exam suggests that a student is ready for college-level mathematics. To achieve this goal, the company recommends that students take a core curriculum of math courses in high school. Suppose a random sample of 250 students who completed this core set of courses results in a mean math score of 24.4 on the college entrance exam with a standard deviation of 3.1. Do these results suggest that students who complete the core curriculum are ready for college-level mathematics? That is, are they scoring above 24 on the mathematics portion of the exam? Complete parts a) through d) below. *** b) Verify that the requirements to perform the test using the t-distribution are satisfied. Check all that apply. A. The sample size is larger than 30. B. The students were randomly sampled. C. A boxplot of the sample data shows no outliers. D. The students' test scores were independent of one another. E. The…
A college entrance exam company determined that a score of 24 on the mathematics portion of the exam suggests that a student is ready for college-level mathematics. To achieve this goal, the company recommends that students take a core curriculum of math courses in high school. Suppose a random sample of 200 students who completed this core set of courses results in a mean math score of 24.2 on the college entrance exam with a standard deviation of 3.4. Do these results suggest that students who complete the core curriculum are ready for college-level mathematics? That is, are they scoring above 24 on the mathematics portion of the exam. What are the test score and the p-value?
A very large company is interested in its employees' productivity. The company reports from its historical data that its employees spend a mean of 164 minutes per employee (on a typical day) dealing with email. To test this claim, an independent consultant chooses 26 employees at random and finds that those employees spend a sample mean of 172 minutes dealing with email, with a sample standard deviation of 21 minutes. Assume that the population of amounts of time employees spend dealing with email is approximately normally distributed. Complete the parts below to perform a hypothesis test to see if there is enough evidence, at the 0.05 level of significance, to reject the claim that u, the mean number of minutes employees spend dealing with email, is equal to 164. (a) State the null hypothesis H, and the alternative hypothesis H, that you would use for the test. Ho: I H: OSO D=D (b) Perform at test and find the p-value. Here is some information to help you with your t test.
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Judy is a psychology student who participates in three competitions: Swimming, cycling, and running in one event. In the last competition, Judy completed the swimming race in 13 minutes and 20 seconds (800 seconds), cycling in 33 minutes and 52 seconds (2032 seconds), and the running race in 17 minutes and 3 seconds (1023 seconds. Completion times for participants in Swimming are normally distributed with a mean of / = 725 seconds and a standard deviation o - 50 seconds. Completion times for participants in Cycling* are normally distributed with a mean of = 2182 seconds and a standard deviation o= 75 seconds. And completion times for participants in Running are normally distributed with a mean of u = 1083 seconds and a standard deviation o = 60 seconds. In which competition race (swimming, cycling, or running) was Judy's performance better, relative to others on average who took part in that competition? Justify your answer, quoting. relevant statistics as part of your explanation
A report states that the mean yearly salary offer for students graduating with a degree in accounting is $48,722. Suppose that a random sample of 50 accounting graduates at a large university who received job offers resulted in a mean offer of $49,870 and a standard deviation of $3900. Do the sample data provide strong support for the claim that the mean salary offer for accounting graduates of this university is higher than the national average of $48,7227 Ho: = Ha: Select an answer V (Put in the correct symbol and value) a = P-value =
A report states that the mean yearly salary offer for students graduating with a degree in accounting is $48,722. Suppose that a random sample of 50 accounting graduates ata large university who received job offers resulted in a mean offer of $49.870 and a standard deviation of $3900, Do the sample data provide strong support for the claim that the mean salary offer for accounting graduates of this university is higher than the national average of $48,722? Ho: = H: p Select an answerY (Put in the correct syimbol and value) P value Based on the above we choose to Select an answer
Suppose a researcher pbserves a population of 12 people and computes SS=204. What is the variance? What is the standard deviation?
The data table contains waiting times of customers at a bank, where customers enter a single waiting line that feeds three teller windows. Test the claim that the standard deviation of waiting times is less than 1.9 minutes, which is the standard deviation of waiting times at the same bank when separate waiting lines are used at each teller window. Use a significance level of 0.01. Assume that the sample is a simple random sample selected from a normally distributed population. Complete parts (a) through (d) below.LOADING... Click on the icon to view the data.Question content area bottomPart 1a. Identify the null and alternative hypotheses. Choose the correct answer below.A.H0: σ<1.9 minutesHA: σ=1.9 minutesB.H0: σ=1.9 minutesHA: σ≠1.9 minutesC.H0: σ≥1.9 minutesHA: σ<1.9 minutesD.H0: σ=1.9 minutesHA: σ<1.9 minutesPart 2b. Compute the test statistic.χ2=enter your response here(Round to two decimal places as needed.)Part 3c. Find the P-value of the test statistic.The…

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