130/2.7EArandom sample of n =755 US cell phone users age 18 and older in May 2011 found that the average number of text messages sentorreceived per day is 41.5 messages, with standard error about 6.1.1.Smith, A, "Americans and Text Messaging." Pew Research Center, http://www.pewinternet.org/Reports/2011/Cell-Phone-Texting-2011/Main-Report/How-Americans-Use-Text-Messaging.aspx, accessed September 19, 2011.Z .Your answeris incorrect.(a) Use the information from the sample to give the best estimate of the population parameter.e Textbook and MediaHintYour answer is incorrect.(b) Find a 95% confidence interval for the mean number of text messages.toi |The 95 % confidence interval isO 70°F Sunny 0ch宜

Answered: Image /qna-images/answer/f11bdb81-2a32-495c-905c-db49712d8d69.jpg

Answered: 0/2.7 A random sample of n = 755 US…

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 survey recently reported that the mean national annual expenditure for inpatient andoutpatient services of all persons over 64 years of age was $5,423 with a standarddeviation of $979. A random sample of 352 persons over age 64 living in Sudbury had anaverage expense of $5,516. We want to test whether the mean inpatient and outpatient expense of all Sudbury residents over age 64 is higher than the national average of $5,423. Calculate the P-value for this test.
The sales rep of a waterbed claims that 25% of the Filipino died because of cardiovascular diseases. A researcher wants to test this claim. A hospital record shows that out of a random sample of 200 dead patients, 55 patients died because of cardiovascular diseases. Does the data provide sufficient evidence to support the claim of the sales rep? Use 0.03 level of significance.
The amount of sodium(in milligrams) in one serving for a random sample of three different kinds of foods is listed here. At the 0.05 level of significance, is there sufficient evidence to conclude that a difference in mean sodium amounts exists among condiments, cereals, and desserts?
The average undergraduate cost of tuition, fees, room, and board for all institutions last year was $ 26,025. A random sample of 40 institutions of higher learning this year indicated that the mean tuition, fees, room and board for sample was $ 27,690, and the population standard deviation is $5492. At the 0.05 level of significance, is there sufficient evidence that the cost has increased?
An article claimed that "those with a college degree reported a higher incidence of sunburn than those without a high school degree—45 percent versus 26 percent." For purposes of this exercise, suppose that these percentages were based on random samples of size 200 from each of the two groups of interest (college graduates and those without a high school degree). Is there convincing evidence that the proportion who experience a sunburn is higher for college graduates than it is for those without a high school degree? (Use pcollege graduates − pwithout a high school degree. Round your test statistic to two decimal places and your P-value to four decimal places.) z = P =
An agency that hires out clerical workers claims its workers can type, on average, at least 60 words per minute (wpmwpm). To test the claim, a random sample of 50 workers from the agency were given a typing test, and the average typing speed was 58.8 wpmwpm. A one-sample tt-test was conducted to investigate whether there is evidence that the mean typing speed of workers from the agency is less than 60 wpmwpm. The resulting pp-value was 0.267. Which of the following is a correct interpretation of the pp-value? The probability is 0.267 that the mean typing speed is 60 wpmwpm or more for workers from the agency. A The probability is 0.267 that the mean typing speed is 60 wpmwpm or less for workers from the agency. B The probability is 0.267 that the mean typing speed is 58.8 wpmwpm or less for workers from the agency. C If the mean typing speed of workers from the agency is 60 wpmwpm, the probability of selecting a sample of 50 workers with mean 58.8…
A college entrance exam company determined that a score of 25 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 150 students who completed this core set of courses results in a mean math score of 25.8 on the college entrance exam with a standard deviation of 3.8. Do these results suggest that students who complete the core curriculum are ready for college-level mathematics? That is, are they scoring above 25 on the mathematics portion of the exam? Complete parts a) through d) below. LOADING... Click the icon to view the table of critical t-values. Identify the test statistic t0= Identify the P-value P-value =
In 2017, it was estimated that 45% of U.S. households purchased groceries at convenience stores. Consider a follow-up study focusing on the last calendar year. What sample size is needed to estimate the population proportion of U.S. households purchasing groceries at convenience stores to within a margin of error of 0.02 with 90% confidence.
A recent poll of 2000 randomly selected 18-25-year-olds revealed that 232 currently use marijuana or hashish. According to a publication, 12.8 % of 18-25-year-olds were current users of marijuana or hashish in 1997. Do the data provide sufficient evidence to conclude that the percentage of 18-25-year-olds who currently use marijuana or hashish has changed from the 1997 percentage of 12.8%? Use α=0.01significance level. test statistic z=: positive critical z score: negative critical z score: The final conclusion is A. There is not sufficient evidence to conclude that the percentage of 18-25-year-olds who currently use marijuana or hashish has changed from the 1997 percentage of 12.8%. B. There is sufficient evidence to conclude that the percentage of 18-25-year-olds who currently use marijuana or hashish has changed from the 1997 percentage of 12.8%.
The bad debt ratio for a financial institution is defined to be the dollar value of loans defaulted divided by the total dollar value of all loans made. Suppose that a random sample of sixty-five banks in Illinois is selected and that their bad debt ratios (recorded as a percentage) are presented in the sample. Banking officials claim that the mean bad debt ratio for all Midwestern banks is 3.5 percent and that the mean bad debt ratio for Illinois banks is higher. What is the null hypothesis? What is the t-value? bank Bad Debt Ratio 1 3.38 2 5.15 3 4.63 4 9.69 5 8.32 6 3.58 7 5.9 8 7.33 9 6.28 10 6.87 11 3.93 12 5.76 13 3.98 14 3.66 15 7.46 16 5.59 17 6.39 18 6.49 19 2.31 20 7.84 21 9.2 22 4.64 23 5.38 24 4.23 25 7.12 26 3.48 27 2.87 28 4.59 29 7.43 30 8.34 31 5.15 32 5.84 33 4.95 34 5.6 35 7.52 36 5.23 37 7.88 38 8.86 39 4.42 40 6.64 41 9.25 42 6.53 43 5.35 44 6.04 45 5.19 46 2.87 47 2.91…
A survey of 64 randomly selected homeowners find that they spend a mean of $62 per month on home maintenance. Construct a 90% competitive interval for the mean amount of money spent per month on home maintenance by all homeowners. Assume that the population standard deviation is $14 per month. Round to the nearest cent
In 1990, 58% of Americans 18 years old and older reported they have a great deal of concern regarding air pollution. A recent poll found that 592 of 1004 Americans 18 years old or older stated that they have a great deal of concern regarding the level of air pollution in American. Is there evidence to conclude that the current proportion of Americans having a great deal of concern about the level of air pollution in America is different from the 1990 proportion, with a 10% level of significance? State the null hypothesis, alternative hypothesis, test statistic, p-value and conclusion.

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