English Air continually monitors the proportion of overweight items checked by passengers on its flights in order to evaluate the appropriateness of theiroverweight fees. Recently, a random sample of 258 items checked on English Air flights to North America contained 48 overweight items, and an independent,random sample of 235 items checked on English Air flights within Europe contained 26 overweight items.Based on these samples, can we conclude, at the 0.10 level of significance, that there is a difference between the proportion p₁ of all items on English Air flightsto North America that are overweight and the proportion p of all items on English Air flights within Europe that are overweight?Perform a two-tailed test. Then complete the parts below.Carry your intermediate computations to three or more decimal places and round your answers as specified in the parts below. (If necessary, consult a list offormulas.)(a) State the null hypothesis Ho and the alternative hypothesis H₁.0H :OH₁:0(b) Determine the type of test statistic to use.(Choose one) ▼(c) Find the value of the test statistic. (Round to three or more decimal places.)7(d) Find the two critical values at the 0.10 level of significance. (Round to three or more decimal places.)ExplanationCheckO SearchC3|xXㅁ=□□XOXSOSO□<口ŚWР3N2022 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy>O FudyPerform a two-tailed test. Then complete the parts below.Carry your intermediate computations to three or more decimal places and round your answers as specified in the parts below. (If necessary, consult a list offormulas.)144Hz4(a) State the null hypothesis Ho and the alternative hypothesis H₁.HoH₁:0(b) Determine the type of test statistic to use.(Choose one) ▼(c) Find the value of the test statistic. (Round to three or more decimal places.)1nglish Air Nights within Europe that are overweight?(d) Find the two critical values at the 0.10 level of significance. (Round to three or more decimal places.)and O(e) Can we conclude that the proportion of items that are overweight is different between the two typesof English Air flights?O Yes O NoExplanationCheckO Searcheμ|xX0²0=0□□XOXSOSOР5W0믐2022 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy C

Given, For English air flights to north America : sample size (n1) = 258 overweight items(x1) = 48…

Answered: English Air continually monitors the…

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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3. If the owner of a gasoline station wants to study gasoline purchasing habits by motorists at his station. A random sample of 30 motorists during a certain week is selected, with the following results:Amount purchased ? = 11.3 gallons, s = 3.1 gallons10 motorists purchased premium grade gasolineAt the 0.10 level of significance, is there evidence that the mean purchase is different from 10 gallons?At the 0.10 level of significance, is there evidence that fewer than 40% of the motorists purchase premium grade gasoline?
The work week for adults in the US that work full time is normally distributed with a mean of 47 hours. A newly hired engineer at a start-up company believes that employees at start-up companies work more on average then most working adults in the US. She asks 12 engineering friends at start-ups for the lengths in hours of their work week. Their responses are shown in the table below. Test the claim using a 10% level of significance. Give answer to at least 4 decimal places. Hours 48 46 53 51 49 68 47 60 48 49 52 55 What are the correct hypotheses? Ho: Select an answer hours H1: Select an answer hours Based on the hypotheses, find the following: Test Statistic= p-value= The correct decision is to Select an answer O that the mean number of The correct summary would be: hours of all employees at start-up companies work more than the US mean of 47 hours. Select an answer
A simple random sample of 1,028 US adults in March 2013 found that 56% support nuclear arms reduction. Does this provide convincing evidence that a majortiy of American supported nuclear arms reduction at the 5% significance level?
A researcher compares differences in positivity between participents in a low, middle, or upper middel class family. If she observes 15 participents in each group. Then what are the degrees of freedom for the one-way between-subjects ANOVA?
3) In a study published by the American Journal of Psychiatry (May 2019) researchers wanted to measure the effect of alcohol on the hippocampal region of the brain in adolescents. 12 adolescents who use alcohol were randomly chosen. Hippocampal volumes were examined. The mean hippocampal volume for the whole population is 9.03 cubic centimeters. An analysis revealed that the mean hippocampal in the 12 chosen subjects was 8.1 cubic centimeters with a standard deviation of 0.7 cubic centimeters. At the 1% level of significance, can it be concluded that the adolescents have a lower hippocampal volume?
In a study of 824 randomly selected medical malpractice lawsuits, it was found that 485 of them were dropped or dismissed. Use a 0.01 significance level to test the claim that most medical malpractice lawsuits are dropped or dismissed. What is the P-value? P-value = (Round to three decimal places as needed.)
In a certain school district, it was observed that 30% of the students in the element schools were classified as only children (no siblings). However, in the special program for talented and gifted children, 107 out of 295 students are only children. The school district administrators want to know if the proportion of only children in the special program is significantly different from the proportion for the school district. Test at the a = 0.01 level of significance. What is the hypothesized population proportion for this test? p = (Report answer as a decimal accurate to 2 decimal places. Do not report using the percent symbol.) Based on the statement of this problem, how many tails would this hypothesis test have? O one-tailed test O two-tailed test Choose the correct pair of hypotheses for this situation: Но:р 3 0.3 Но :р — 0.3 | Но:р — 0.3 (A) (B) (C) H:p 0.3 Но: р— 0.363| Но :р — 0.363 | Но: р— 0.363 (D) (E) (F) H:p 0.363 (В) (D) (E) (F) Using the normal approximation for the…
According to a publication, 13.9% of 18 to 25-year-olds were users of marijuana in 2000. A recent poll of 1366 randomly selected 18 to 25-year-olds revealed that 221 currently use marijuana. At the 1% significance level, do the data provide sufficient evidence to conclude that the percentage of 18 to 25-year-olds who currently use marijuana has changed from the 2000 percentage of 13.9%? Use the one-proportion z-test to perform the appropriate hypothesis test, after checking the conditions for the procedure. What are the hypotheses for the one-proportion z-test? H0: p=nothing; Ha: p ▼ greater than> less than< not equals≠ nothing (Type integers or decimals.) What is the test statistic? z=nothing (Round to two decimal places as needed.) Identify the P-value. The P-value is nothing. (Round to four decimal places as needed.) What is the correct conclusion for the hypothesis test? A. Do not reject H0; the data do provide sufficient…
The data "sea_pets_samp" is a simple random sample of 100 cases from the dataset "seattlepets" from OpenIntro.Org. Each case is a registered pet in Seattle, WA between 2003 and 2018. There 71 dogs in the sample, 9 of which are Labrador Retrievers. Question:"Is there evidence at the 1% significance level that more than 10% of the registered dogs in Seattle were Labrador Retrievers between 2003 and 2008?"
Reports show that 92% of online searches in March 2021 use Google as the search engine. A network administrator wants to determine whether the percentage of searches that use Google is different in their company. They sample 800 searches and find that 758 of them use Google. Can they conclude that the percentage of searches that use Google in this company differs from 92%? Use the a = 0.05 level of significance.
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 3 on the college entrance exam with a standard deviation of 3.7. 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. E a) State the appropriate null and alternative hypotheses. Fill in the correct answers below. The appropriate null and alternative hypotheses are H -24 versus H₂H b) Verify that the requirements to perform the test using the t-distribution are satisfied. Check all that apply. >24 A. The sample data come from a…
In a recent year, 73% of first-year college students responding to a national survey identified "being very well-off financially" as an important personal goal. A state university finds that 132 of an SRS of 200 of its first-year students say that this goal is important. Which of the following steps contains an error in the test to see if these data provide convincing evidence at the a = 0.05 significance level that the proportion of all first-year students at this university who think being very well-off is important differs from the national value of 73%? The test statistic and P-value are z = 0.66-0.73 0.73(0.27) 200 =-2.23, P-value = 0.0258 For a one-sample z test for p. Random: We have an SRS of 200 first-year students. 10%: The sample size (200) is less than 10% of first-year students at this university. Large Counts: npo = 200(0.66) = 132 > 10 and n(1 - Po) = 200(0.34) = 68 > 10. The conclusion states that because the P-value of 0.0258

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