According to a report, 12% of all airlinepassengers flew first-class at least once.In a sample of 80 passengers, 19 of themhave flown first-class. At a = 0.01, isthere enough evidence to support a claimthat the report's percentage was toolow?In the space provided, show all work tomake your conclusion. Be sure to includenull and alternative hypotheses, criticalvalue, test value, and your conclusion.

Answered: Image /qna-images/answer/305f6691-5865-4087-b28b-90272ece19d3.jpg

Answered: According to a report, 12% of all…

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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A ski lift manager is interested in the average daily number of ski lift users. In previous years, fewer than 945 people, on average, have used the ski lift daily over the winter season. The manager suspects this average has increased in recent years. If the ski lift manager chooses to use the p-value approach for his hypothesis test, what does he need to compare the p-value to?
An organization published an article stating that in any one-year period, approximately 8.2 percent of adults in a country suffer from depression or a depressive illness. Suppose that in a survey of 100 people in a certain town, six of them suffered from depression or a depressive illness. Conduct a hypothesis test to determine if the true proportion of people in that town suffering from depression or a depressive illness is lower than the percent in the general adult population in the country. p' = Calculate ?x. Find the p-value.
The U.S. Department of Labor stated that the national unemployment rate was 4.9%. Of a sample of 90 people in one city, 5.2% were unemployed. Can the city conclude that their unemployment rate is the same as the national average? Do we reject the null hypothesis? (Answer on Excel)
Dreamfilms Studios boasts that its summer features are so good that at least half of all tickets sold one summer are for its films. A competing studio claims that less than half of all tickets sold are for Dreamfilms' movies. After the hypothesis test is completed, the conclusion is to fail to reject the null hypothesis. If the true percentage of tickets sold for Dreamfilms Studios' movies that summer was only 48%, was an error committed? If so, what type?
A common characterization of obese individuals is that their body mass index is at least 30 [BMI = weight/(height)2, where height is in meters and weight is in kilograms]. An article reported that in a sample of female workers, 269 had BMIs of less than 25, 156 had BMIs that were at least 25 but less than 30, and 121 had BMIs exceeding 30. Is there compelling evidence for concluding that more than 20% of the individuals in the sampled population are obese? (c) What is the probability of not concluding that more than 20% of the population is obese when the actual percentage of obese individuals is 23%? (Round your answer to four decimal places.)
Ex 9. Suppose that a national survey finds that 73 percent of restaurant employees say that work stress has a negative impact on their personal lives. A random sample of 200 employees of a large restaurant chain finds that 141 employees say that work stress has a negative impact on their personal lives. a. Formulate the null and alternative hypotheses needed to attempt to provide evidence that the percentage of work-stressed employees for the restaurant chain differs from the national percentage. b. Use critical values to perform the hypothesis test by setting α equal to .10, .05, .01, and .001
The worldwide market share for a web browser was 20.5% in a recent month. Suppose that a sample of 240 random students at a certain university finds that 60 use the browser. Complete parts (a) through (d) below. Question content area bottom Part 1 a. At the 0.01 level of significance, is there evidence that the market share for the web browser at the university is greater than the worldwide market share of 20.5%? Determine the null and alternative hypotheses. A. H0: π≤0.205; H1: π>0.205 B. H0: π=0.205; H1: π≠0.205 C. H0: π≠0.205; H1: π=0.205 D. H0: π≥0.205; H1: π<
The average life expectancy of tires produced by the Whitney Tire Company has been 40,000 miles. Management believes that due to a new production process, the life expectancy of its tires has increased. In order to test the validity of this belief, what is the correct set of hypotheses.
A newsletter publisher believes that 29% of their readers own a laptop. Is there sufficient evidence at the 0.05 level to refute the publisher's claim? State the null and alternative hypothesis for the above scenario
In a random survey of 500 doctors that practice specialized medicine, 20% felt that health care should beprivatized in Canada. In a random sample of 800 family physicians, 30% felt that the health care should beprivatized in Canada. Is there any difference in the two proportions? Use α = 0.10.a. Are the conditions met for using a z test to test this claim? b. Use the four-step P-value approach and test the claim described here. c. Using the critical value approach, test the hypothesis for the claim described here. Include all key steps ofthe test of hypothesis.
In a random survey of 500 doctors that practice specialized medicine, 20% felt that health care should beprivatized in Canada. In a random sample of 800 family physicians, 30% felt that the health care should beprivatized in Canada. Is there any difference in the two proportions? Use α = 0.10.a. Are the conditions met for using a z test to test this claim?b. Use the four-step P-value approach and test the claim described here. c. Using the critical value approach, test the hypothesis for the claim described here. Include all key steps ofthe test of hypothesis.
A research group wants to estimate the proprtion, p, of americans who can speak a language other than English. By referencing past data, the group belive that more than 45% of Americans can do so. a. state the null and alternative hypotheses for testing the group's belief/ b. If the value of the test statistic is approximately 1.46, what is the conslusion (reject H0 of fail to reject H0) of the hypotesis test? with a-0.05 c. If the true balue of is 48%, did the researchers make an error? if so what type?

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