Anthropologists can estimate the birthrate of an ancient society by studying the agedistribution of skeletons found in ancient cemeteries. The numbers of skeletons found attwo such sites, as reported in the article "Paleoanthropological Traces of a NeolithicDemographic Transition" (J. Bocquet-Appel, Current Anthropology, 2002:637–650) are given in the following table:Ages of Skeletons0-4 years 5-19 years 20 years or moreSiteCasa da Moura2761126Wandersleben3860118Do these data provide convincing evidence that the age distributions differ between the twosites?

State the test hypotheses. Null hypothesis: H0: The age distributions do not differ between the two…

Answered: Anthropologists can estimate the…

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 94 students in a statistics class are categorized by gender and by the year in school. The numbers obtained are displayed below in Figure 1. Gender Male Female Total Year in school Freshman Sophomore Junior Senior 2 9 17 17 13 7 19 22 24 1 23 24 Fig. 1: Summary Graduate Total 2 3 5 31 63 94 (a) What proportion of the statistics students in this class is sophomores? (b) What proportion of the statistics students in this class is male? (c) The data are going to be summarized by computing the conditional distribu- tions of year in school for male and female students. What would be the entry (in proportions) for male sophomores?
Exhibit 11-2 Last school year, the student body of a local university consisted of 30% freshmen, 24% sophomores, 26% juniors, and 20% seniors. A sample of 300 students taken from this year's student body showed the following number of students in each classification. Freshmen 83 Sophomores 68 Juniors 85 Seniors 64 We are interested in determining whether or not there has been a significant change in the classifications between the last school year and this school year. Refer to Exhibit 11-2. The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals О а.7.815 b. 1.645 с. 2.75 n d.1.96.
Exhibit 11-2 Last school year, the student body of a local university consisted of 30% freshmen, 24% sophomores, 26% juniors, and 20% seniors. A sample of 300 students taken from this year's student body showed the following number of students in each classification. Freshmen 83 Sophomores 68 Juniors 85 Seniors 64 We are interested in determining whether or not there has been a significant change lin the classifications between the last school year and this school year. Refer to Exhibit 11-2. The expected number of freshmen is
Tree-ring dating from archaeological excavation sites is used in conjunction with other chronologic evidence to estimate occupation dates of prehistoric Indian ruins in the southwestern United States. Suppose it is thought that a certain pueblo was occupied around 1294 A.D. (based on evidence from potsherds and stone tools). The following data give tree-ring dates (A.D.) from adjacent archaeological sites: 1189 1267 1268 1275 1275 1271 1272 1316 1317 1230 (i) Use a calculator with sample mean and standard deviation keys to find x and s. (Round your answers to one decimal place.) x = A.D. s = yr ii-What is the value of the sample test statistic? (Round your answer to three decimal places.)
15. Diameter of Douglas Fir Trees The diameter of the Douglas fir tree is measured at a height of 1.37 meters. The S following data represent the diameter in centimeters of a random sample of 12 Douglas firs in the western Washington Cascades. 156 162 147 173 147 190 130 101 159 113 181 109 Source: L. Winter. "Live Tree and Tree-Ring Records to Reconstruct the Structural Development of an Old-Growth Douglas Fir/Western Hemlock Stand in the Western Washington Cascades." Corvallis, OR: Forest Science Data Bank, 2005. (a) Obtain a point estimate for the mean and standard deviation diameter of a Douglas fir tree in the western Washington Cascades. (b) Because the sample size is small, we must verify that the data come from a population that is normally distributed and that the data do not contain any outliers. The figures show the normal probability plot and boxplot. The correlation between the tree diameters and expected z-scores is 0.982. Use Option 1 or Option 2 to determine if the…
A random sample of 20 adults in a particular country were asked to state what type of birth control method they use. The results are in the table below. None None None Condom Condom Condom Pill Pill Other Other Pill Other Condom Condom Pill None Condom Pill Pill Other a) Since data were collected for variable(s), the correct graph to make is a . b) Complete the frequency/relative frequency table. Birth Control Type Frequency Relative Frequency None Condom Pill Other c) Which of the following is the correct bar chart for the given data? 2468Birth Control TypeFreqNoneCondomPillOther[Graphs generated by this script: setBorder(49,45,0,10); initPicture(0,13,0,8);axes(1000,2,1,1000,2); fill="blue"; textabs([165,0],"Birth Control…
5. Suppose a marketing research firm would like to examine if the social networking site that a person primarily uses is influenced by his or her age. In a randomly drawn sample, 369 social network users were asked which site they primarily visited. These data are presented in the following table along with each person's age group. Complete parts a. through c. below. 1 Click the icon to view the data table. a. Using a = 0.025, perform a chi-square test to determine if age group and social networking site used are independent of one another. Identify the null and alternative hypotheses for a chi-square test of independence based on the information in the table. Choose the correct answer below. O A. Ho: Age group and social networking site are independent of one another. H: Age group and social networking site are not independent of one another. O B. Ho: Age group and social networking site are independent of one another. H,: The age group affects the social networking site. OC. Ho: Age…
Construct a boxplot as requested. The weights (in pounds) of 30 newborn babies are listed below. Draw a boxplot for the data set. 5.5 5.7 5.8 5.9 6.1 6.l 63 6.4 6.5 6.6 6.7 6.7 6.7 6.9 7.0 7.0 7.0 7.1 72 72 7.4 7.5 7.7 7.7 7.8 8.0 8.1 S.1 8.3 8.7 5.5 6.4 7.0 7.7 8.7 B 5.5 6.475 7.7 8.3 5.5 6.4 7.4 7.7 8.7 E 5.5 6.3 7.0 7.8 8.7 B.
Question 9 of 16 O Attempt 1 For each of the hypothetical data sets, determine whether a bar graph or a pie chart would be an appropriate way to display the data. In some cases, both types of graphs may be appropriate. the percent of individuals with each of the following natural eye colors: brown, blue, green, hazel, and other bar graph pie chart bar graph pie chart the population density of cach of the 50 states in the United States bar graph the number of college students who play the guitar, the piano, or the trombone pie chart the number of K-12 schools that are public compared to the number of private and charter schools Answer Bank pie chart bar graph
32)
A particular report included the following table classifying 816 fatal bicycle accidents that occurred in a certain year according to the time of day the accident occurred. Time of Day Number of Accidents midnight to 3 a.m. 46 3 a.m. to 6 a.m. 50 6 a.m. to 9 a.m. 85 9 a.m. to noon 72 noon to 3 p.m. 79 3 p.m. to 6 p.m. 157 6 p.m. to 9 p.m. 193 9 p.m. to midnight 134 For purposes of this exercise, assume that these 816 bicycle accidents are a random sample of fatal bicycle accidents. Do these data support the hypothesis that fatal bicycle accidents are not equally likely to occur in each of the 3-hour time periods used to construct the table? Test the relevant hypotheses using a significance level of a = 0.05. Let P1. P2: P3: P4 Ps: Pe: P7, and Pg be the proportions of accidents occurring in the eight different time periods. State the appropriate null and alternative hypotheses. O Ho: P1 = P2 = P3 = P4 = Ps = P6 = P7 = Pg = 816 H: Ho is not true. O Ho: P1 = P2 = P3 = P4 = P5 = P6 = P7 =…
QUESTION 10 Obtain the five-number summary for the given data. The weekly salaries (in dollars) of sixteen government workers are listed below. 690 607 813 642 728 587 475 622 523 671 685 452 563 787 498 826 452, 543.0, 632.0, 709, 826 O452, 523, 622, 690, 826 452, 533.00, 632.0, 718.5, 826 452, 533.00, 622, 718.5, 826 00

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