The t-score distribution for df = 4 resembles the z-score distribution in shape more than a t-score distribution for df = 20. a. True b. False
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The t-score distribution for df = 4 resembles the z-score distribution in shape more than a t-score distribution for df = 20.
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- A test of the claim that the proportion of residents with at least 2 years of college education is more than 57% produces the test statistic z = 1.502. Find the P-value.10 2 10 12 Would you expect the mean to be greater than or less than the mean for this Histogram ? Explanation is: mean less than median since skewed right mean less than median since skewed left mean greater than median since skewed rightAttached
- Which of the following is true of z scores that fall below the mean? Group of answer choices They are negative. They are equal to the mode. They are positive. They are in the upper half of the distribution.HI T F. %24 E Z. Find the margin of error for the given values of c, s, and n. c = 0.98, s= 2.9, n = 21 Click the icon to view the t-distribution table. The margin of error is (Round to one decimal place as needed.) Enter your answer in the answer box and then click Check Answer. All parts showing Clear All Check Answer e Type here to search 查。 F1 F2 F3 F4 F5 %23 & 3. 4. 9.Must the variable under consideration be normally distributed for you to use the ?-interval procedure or ?-interval procedure? Explain your answer.
- Suppose that insurance companies did a survey. They randomly surveyed 400 drivers and found that 310 claimed they always buckle up. We are interested in the population proportion of drivers who claim they always buckle up. Which distribution should you use for this problem? (Round your answer to four decimal places.)What z-score value separates 30% of the distribution in the tail on the left (i.e., the bottom 30% of the distribution) from the rest of the distribution ? z=Q2: Which of the following is the correct mean for the given data: -2, -1, 0, 1,2 (A) 2 (B) 0 (C) 2.5 (D) None of the above
- A survey was conducted two years ago asking college students their top motivations for using a credit card. You think this distribution has changed. You randomly select 425 college students and ask each one what the top motivation is for using a credit card. Can you conclude that there has been a change in the distribution? Use a = 0.025. Complete parts (a) through (d). Response Old Survey % 29% New Survey Frequency, f Rewards 110 Low rates Cash back Discounts 23% 96 21% 109 7% 46 Other 20% 64 O B. The distribution of motivations is 110 rewards, 96 low rate, 109 cash back, 46 discounts, and 64 other. O C. The distribution of motivations is 29% rewards, 23% low rate, 21% cash back, 7% discounts, and 20% other. Which hypothesis is the claim? o Ho (b) Determine the critical value, Yo, and the rejection region. X = 11.143 (Round to three decimal places as needed.) Choose the correct rejection region below. Oc. X6Español A coin-operated coffee machine made by BIG Corporation was designed to discharge a mean of 7.2 ounces of coffee per cup. BIG has good reason to believe that the mean amount of coffee dispensed by the machine, u, is greater than 7.2 ounces, and plans to do a statistical test of the claim that the machine is working as designed. Technicians gather a random sample of fill amounts and find that the mean of the sample is 7.6 ounces and that the standard deviation is 0.5 ounces. Based on this information, complete the parts below. (a) What are the null hypothesis H. and the alternative hypothesis H, that should be used for the test? Ho :0 OSEE MORE QUESTIONSRecommended textbooks for youMATLAB: An Introduction with ApplicationsStatisticsISBN:9781119256830Author:Amos GilatPublisher:John Wiley & Sons Inc
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