2-Is the source of news independent of age? Results of a random sample are in the following 2-way tableTelevisione Internet40RadioTotal30e62e70e<3085e30-50e110-138e50-70148e102e>70e83117e55eTotal1040e

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Answered: 2-Is the source of news independent of…

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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17 Statistics students in Oxnard College sampled 11 textbooks in the Condor bookstore and recorded the number of pages in each textbook and its cost. The data are shown below: Number of Pages (xx) Cost(yy) 230 34.5 944 154.6 666 100.9 930 153.5 221 40.15 375 69.25 442 66.3 722 118.3 921 152.15 885 149.75 761 131.15 A student calculates a linear model using technology (Statistics Calculator or Computer)y = ___ x + ____ . (Please show your answers to two decimal places)Use the model to estimate the cost when number of pages is 424.Cost = $_______
Consider the following random sample of data: 13, 24, 29, 16, 22, 5, 10, 1, 105, 18 a) What is the median of the sample data? Round your response to 2 decimal places. Number b) If the outlier is removed, what is the median of the remaining sample data? Number
A consumer magazine wants to compare the lifetimes of ballpoint pens of three different brands (measured in days). The magazine takes a random sample of pens of each type in the following table. What is the correct test statistic? Brand 1 Brand 2 Brand 3 382 181 238 242 140 257 216 162 241 319 218 213 a. F (2, 9) = 5.54 b.r = -.34 c. t (11) = 12.16 d.p = .027
Scores in the first and fourth (final) rounds for a sample of 20 goiters who competea in goir tournaments are shown in the following table. Player Golfer 1 Golfer 2 Golfer 3 Golfer 4 Golfer 5 Golfer 6 Golfer 7 Golfer 8 Golfer 9 Golfer 10 Ho: Md > O Ha: Moso d First Round O Ho: H0 Ha: Md 70 = 0 71 70 72 70 67 71 68 67 70 Final Round 72 72 73 71 69 67 67 72 71 69 Player Golfer 11 Golfer 12 Golfer 13 Golfer 14 Golfer 15 Golfer 16 Golfer 17 Golfer 18 Golfer 19 Golfer 20 First Round 72 72 70 70 68 68 71 70 69 67 Final Round 72 70 73 77 70 65 70 68 Suppose you would like to determine if the mean score for the first round of a golf tournament event is significantly different than the mean score for the fourth and final round. Does the pressure of playing in the final round cause scores to go up? Or does the increased player concentration cause scores to come down? 68 (a) Use α = 0.10 to test for a statistically significantly difference between the population means for first- and fourth-round…
It has been claimed that over 30 percent of entering college students have blood cholesterol levels of at least 200. Randomly select 20 students in the list in Table 1 to test this hypothesis. What conclusion do you draw at the 5 percent level of significance
Consider the following random sample of data: -7, 5, -1, -1, 8, 1, 7, -4, 8, 80 a) What is the mean of the sample data? Round your response to at least 2 decimal places. Number b) If the outlier is removed, what is the mean of the remaining sample data? Round your response to at least 2 decimal places. Number
Two computer users were discussing tablet computers. A higher proportion of people ages 16 to 29 use tablets than the proportion of people age 30 and older. The table below details the number of tablet owners for each age group. Test at the 1% level of significance. (For subscripts let 1 = 16-29 year old users, and 2 = 30 years old and older users.) 16–29 year olds 30 years old and older Own a Tablet 69 231 Sample Size 625 2,313 NOTE: If you are using a Student's t-distribution for the problem, including for paired data, you may assume that the underlying population is normally distributed. (In general, you must first prove that assumption, though.) Part (a) State the null hypothesis. H0: p1 < p2 H0: p1 > p2 H0: p1 ≠ p2 H0: p1 = p2 H0: p1 ≥ p2 Part (b) State the alternative hypothesis. Ha: p1 < p2 Ha: p1 ≠ p2 Ha: p1 = p2 Ha: p1 > p2 Ha: p1 ≤ p2 Part (c) In words, state what your random variable P'1 − P'2 represents. P'1 −…
Consider the following random sample of data: 9, -9, 0, 5, 10, 7, 1, -6, -1, 82 a) What is the mean of the sample data? Round your response to at least 2 decimal places. Number b) If the outlier is removed, what is the mean of the remaining sample data? Round your response to at least 2 decimal places. Number
Primary seat belt laws allow police to stop a motorist for not wearing a seat belt. According to the National Highway Traffic Safety Administration, the percentage of drivers wearing seat belts in the Limpopo province was 68.5% in 2017 and 72% in 2018. Assume that these percentages are based on random samples of 1000 drivers in 2017 and 1050 in 2018. Suppose you must test at 5% level of significance whether the proportion of all drivers in Limpopo province who used seat belts in 2017 is lower than that for 2018. 1 Questions I) Determine the alternative hypothesis to be tested: II) Determine the value of test statistic: III) Determine the p-value for this problem: IV) the conclusion Since Z=-1.734 is greater than Z subscript 0.05 end subscript equals negative 1.645, we then reject the null hypothesis at 5% level of significance and conclude that the proportion of all drivers in Limpopo province who used seat belts in 2017 is lower than that for 2018. b) Since Z=-1.734 is less…

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2-Is the source of news independent of age? Results of a random sample are in the following 2- way table Radioe Televisione Internete Totale <30e 30e 40e 85e 30-50e 50-70e 62e 70e 110e 148e 138e 102e >70e 83e 117e 55e Totale 1040e