The accompanying data on seat belt use for each of the 50 U.S. states and the District of Columbia are from a nationwide survey. The observations represent thepercentage of drivers wearing seat belts in a large nationwide observational survey.6H7L7H8Lstem leaf8H95.69L9H88.5 87.380.3 94.2 90.3 92.987.974.3 97.0 82.5 85.0 92.0 93.3 88.7 97.2 93.478.2 78.7 73.9 70.0 94.1 70.385.8 86.084.6 79.386.2 97.7 83.7 87.5 90.0 69.0 87.684.2 84.9(a) The values in the data set range from 69.0% to 97.7%. Construct a stem-and-leaf display that uses repeated stems 6H, 7L, 7H, 9H. (Enter numbers frosmallest to largest separated by spaces. Enter NONE for stems with no values. Hint: See Example 3.10.)87.592.2 76.7 93.2 94.892.0 90.7 90.7 80.990.884.983.5 84.0 77.2 94.6 (b) Write a few sentences commenting on what the stem-and-leaf display suggests about seat belt use.There ---Select---state-to-state variability in percent of drivers wearing seat belts, and seat belt use percentages tend to be relatively ---Select---median seat belt use percentage is around ---Select---îThe

Answered: The accompanying data on seat belt use…

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 is carried out at a university to estimate the percentage of undergraduates living at home during the current term. What is the population? the parameter?
Use the given data to complete parts (a) and (b) below. y 2.2 3.8 4 1.5 2.9 3.7 4.6 4.9 (b) Draw a scatter diagram of the data with the additional data point (10.4,9.3). Choose the correct answer below. OA. OB. Oc. OD 124 12- 12- 12 8- 8- 8- 4- 4.
Several methods of estimating the number of seeds in soil samples have been developed by ecologists. An article gave the accompanying data on the number of seeds detected by the direct method and by the stratified method for 27 soil specimens. Specimen Direct Stratified 1 21 7 2 34 38 3 0 7 4 60 58 5 20 54 6 61 61 7 40 27 8 7 7 9 14 7 10 94 100 11 1 0 12 67 58 13 78 67 14 21 54 Specimen Direct Stratified 15 34 27 16 0 0 17 38 38 18 18 14 19 94 94 20 1 14 21 40 47 22 21 21 23 0 0 24 7 14 25 14 40 26 18 14 27 40 78 Do the data provide sufficient evidence to conclude that the mean number of seeds detected differs for the two methods? Test the relevant hypotheses using ? = 0.05. (Use ?direct − ?stratified.) Find the test statistic. (Round your answer to two decimal places.) t = Find the df. (Round your answer down to the nearest whole number.) df = Use technology to find the P-value. (Round your answer to four…
Several methods of estimating the number of seeds in soil samples have been developed by ecologists. An article gave the accompanying data on the number of seeds detected by the direct method and by the stratified method for 27 soil specimens. Specimen Direct Stratified 1 21 6 2 32 38 3 0 6 4 60 58 5 20 52 6 61 61 7 40 26 8 6 6 9 12 6 10 92 100 11 1 0 12 66 58 13 78 66 14 21 52 Specimen Direct Stratified 15 32 26 16 0 0 17 38 38 18 18 12 19 92 92 20 1 12 21 40 46 22 21 21 23 0 0 24 6 12 25 12 40 26 18 12 27 40 78 Do the data provide sufficient evidence to conclude that the mean number of seeds detected differs for the two methods? Test the relevant hypotheses using ? = 0.05. (Use ?direct − ?stratified.) Find the test statistic. (Round your answer to two decimal places.) t = Find the df. (Round your answer down to the nearest whole number.) df = Use technology to find the P-value. (Round your answer to four…
A recent poll revealed the political affiliations of 205 Americans, along with the region of the country in which they reside. Political Affiliation Democrat Independent Republican Northeast 14 26 12 Region Southeast 13 23 17 West 34 37 29 If you wish, you may download the data in your preferred format. CrunchIt! CSV Excel JMP Mac Text Minitab PC Text R SPSS TI Calc To test whether region of residence and political affiliation were related, one of the pollsters computed a chi-squard statistic, x = 3.4318, with four degrees of freedom and set an alpha (a) level of 0.05. Determine the P-value of the chi-square statistic in this test for independence and report it to at least three decimal places. You will need to use some kind of software (statistical package or calculator that does statistical computations) to get the P-value that precisely. P%3D
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Construct a complete frequencydistribution table for the following data. Also make frequency polygon, relative frequency histogram and ogive. 3.0,5.0,6.2,7.6,9.4,3.3,5.2,6.3,7.6,9.5,3.5,5.5,6.4,7.7,9.5,3.5,5.5,6.6,7.8,10.0,3.6,5.5,6.6,7.8,10.5,4.0,5.8,6.8,8.5,10.8,4.0,5.8,6.8,8.5,10.9,4.2,5.9,6.8,8.8,11.0,4.6,6.0,7.0,8.8,11.0
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