The shares of the U.S. automobile market held in 1990 by General Motors, Japanese manufacturers, Ford, Chrysler, and other manufacturers were, respectively, 37%, 20%, 22%, 12%, and 9%. Suppose that a new survey of 1,000 new-car buyers shows the following purchase frequencies: GM Japanese Ford Chrysler Other 399 205 262 47 87 Epicture Click here for the Excel Data File (a) Show that it is appropriate to carry out a chi-square test using these data. Each expected value is 2 (b) Determine whether the current market shares differ from those of 1990. Use a = .05. (Round your answer to 3 decimal places.) x^2

The shares of the U.S. automobile market held in 1990 by General Motors, Japanese manufacturers, Ford, Chrysler, and other manufacturers were, respectively, 37%, 20%, 22%, 12%, and 9%. Suppose that a new survey of 1,000 new-car buyers shows the following purchase frequencies: GM Japanese Ford Chrysler Other 399 205 262 47 87 Epicture Click here for the Excel Data File (a) Show that it is appropriate to carry out a chi-square test using these data. Each expected value is 2 (b) Determine whether the current market shares differ from those of 1990. Use a = .05. (Round your answer to 3 decimal places.) x^2

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 Wall Street Journal's Shareholder Scoreboard tracks the performance of 1,000 major U.S. companies. The performance of each company is rated based on the annual total return, including stock price changes and the re investment of dividends. Ratings are assigned by dividing all 1,000 companies into five groups from A (top 20%) , B (next 20%), to E (bottom 20%). Shown here are the one- year ratings for a sample of 60 of the largest companies. ABCD 5 8 15 20 12 Do the largest companies differ in performance from the performance of the 1,000 companies in the Shareholder Scoreboard? Use α = 0.05. State the null and alternative hypotheses. Ho: The proportions of the largest companies compared to the 1,000 companies are the same for at least one of the five groups. Ha : The proportions of the largest companies compared to the 1,000 companies are different for all five groups. Ho: The largest companies differ in performance from the 1,000 companies. H₂: : The largest companies do not differ…
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A recent survey of 1030 U.S. adults selected at random showed that 627 consider the occupation of firefighter to have very great prestige. Estimate the probability (to the nearest hundredth) that a U.S. adult selected at random thinks the occupation of firefighter has very great prestige.
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In a US presidential election, the incumbent president wins with 51.5% of the vote to 48.2% for the primary challenger (and .3% to others). In a nationwide telephone poll of 1000 people conducted exactly one week before the election by a university polling group, 49% of people polled supported the incumbent president, 50% supported the challenger, and 1% supported other candidates. a. For the polling study, what was the population of interest? b. What was the sample? c. Why did the sample results differ from the population? d. What are two constants that might have limited the generalizability of the polling results?
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Human blood is classified by the presence or absence of three main antigens (A, B, and Rh). When a blood specimen is typed, the presence of the A and/or B antigen is indicated by listing the letter A and/or the letter B. If neither the A nor the B antigen is present, the letter O is used. The following table gives the percent of a country's population having each of the eight possible blood types in the sample space. Note that the presence or absence of the Rh antigen is indicated by the symbols + or -, respectively. 0 Blood Types Percent A+ A 6.3 35.7 B+ B 8.5 1.5 AB+ AB 3.4 0.8 0+ 37.2 (a) What is the probability that a person selected at random from the population has a blood type that is type A given that the person is Rh? (Round your answer to two decimal places.) 6.6 (b) What is the probability that a person selected at random from the population has a blood type that is Rh* given that the person is type B? (Round your answer to two decimal places.)
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Human blood is classified by the presence or absence of three main antigens (A, B, and Rh). When a blood specimen is typed, the presence of the A and/or B antigen is indicated by listing the letter A and/or the letter B. If neither the A nor the B antigen is present, the letter O is used.The following table gives the percent of a country's population having each of the eight possible blood types in the sample space. Note that the presence or absence of the Rh antigen is indicated by the symbols + or −, respectively. Blood Types A+ A− B+ B− AB+ AB− O+ O− Percent 35.7 6.1 9.5 1.5 3.4 0.8 37.4 5.6 (a) What is the probability that a person selected at random from the population has a blood type that is type A given that the person is Rh−? (Round your answer to two decimal places.)(b) What is the probability that a person selected at random from the population has a blood type that is Rh+ given that the person is type B? (Round your answer to two decimal places.)
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