A sample of birth weights of 38 girls was taken. Below are theresults (in g):4002.73558.2 313104.43405.23094.43145.72903.53641.13530.42348.23027.43542.72151.53583.63280.34072.12989.53595.12444.43537.219693720.53440.53395.83323.13475.63159.53099.83070.72838.12997.8258425772850.52995.62940.93845.83173.6(Note: The average and the standard deviation of the dataare respectively 3168.8 g and 480.8 g.)Use a 1% significance level to test the claim that thestandard deviation of birthweights of girls is less than thestandard deviation of birthweights of boys, which is 510 g.Procedure:Select an answerAssumptions: (select everything that applies)Population standard deviation is unknownThe number of positive and negative responses areboth greater than 10O Population standard deviation is knownNormal populationSample size is greater than 30Simple random sample

Answered: A sample of birth weights of 38 girls…

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 average time a task is performed, according to a report, is 10.4 minutes. To corroborate this, a sample of 33 tasks is taken, the times are shown in minutes. 10.3779 10.0252 10.2861 10.3979 10.0694 10.8179 10.8184 10.9823 10.2112 10.3799 10.2861 10.6286 10.6819 10.2849 10.8414 10.6787 10.8702 10.7437 10.0114 10.9530 10.9099 10.0739 10.5489 10.6288 10.2556 10.7140 10.8834 10.5082 10.6210 10.6537 10.6053 10.5475 10.0483 Prepare a hypothesis test, with a significance level of 0.1, to investigate if the population mean is greater than 10.4 minutes. A p-value 0.007365 value of the test statistic: 2.4388 Rejection H0 B p-value 0.007365 value of the test statistic: 2.4388 NO Rejection H0 C p-value 0.21365 value of the test statistic: 2.4388 NO Rejection H0 D p-value 0.007365 value of the test statistic: 2.4766 Rejection H0
An article gives the price-an estimated average for a 6-ounce can or a 7.06-ounce pouch-for 14 different brands of water- packed light tuna, based on prices paid nationally in supermarkets. 1.00 1.91 1.23 0.87 0.67 0.53 1.41 1.12 0.61 0.66 0.70 0.61 0.60 0.68 (a) Find the average price for the 14 different brands of tuna. (Round your answer to two decimal places.) $ (b) Find the median price for the 14 different brands of tuna. $ (c) Based on your findings in parts (a) and (b), do you think that the distribution of prices is skewed? Explain. More information is needed to determine skewness. O Since the mean is larger than the median, the distribution is skewed to the right. O Since the median is larger than the mean, the distribution is skewed to the left. O Since the mean and median are equal, the distribution is not skewed.
A survey of the opinions of property owners about a street widening project was taken to determine whether the resulting opinion was related to the distance of front footage. A randomly selected sample of 100 property owners was contacted and the results are shown below. Opinion Front-Footage For Undecided Against Under 45 feet 12 4 4 45 – 120 feet 35 5 30 Over 120 feet 3 2 5 What is the computed value of chi-square? 5.4787 4.9985 9.2784 7.9842 11.0355
Each observation in a random sample of 101 bicycle accidents resulting in death was classified according to the day of the week on which the accident occurred. Data consistent with information are given in the following table. Day of Week Sunday Monday Tuesday Wednesday Thursday Friday Saturday Frequency 15 12 12 14 15 18 15 Based on these data, is it reasonable to conclude that the proportion of accidents is not the same for all days of the week? Use a = 0.05. Calculate the test statistic. (Round your answer to two decimal places.) x² Use technology to calculate the P-value. (Round your answer to four decimal places.) P-value = State the conclusion in the problem context. Reject Ho. We have convincing evidence that the proportion of accidents is not the same for all days of the week. Fail to reject Ho. We do not have convincing evidence that the proportion of accidents is not the same for all days of the week. Reject Ho. We do not have convincing evidence that the proportion of…
A statistical program is recommended. A paper gave the following data on n = 11 female black bears. Age(years) Weight(kg) Home-RangeSize (km2) 10.5 54 43.0 6.5 40 46.6 28.5 62 57.4 6.5 55 35.7 7.5 56 62.0 6.5 62 33.8 5.5 42 39.7 7.5 40 32.3 11.5 59 57.2 9.5 51 24.3 5.5 50 68.6 (a) Fit a multiple regression model to describe the relationship between y = home-range size and the predictors x1 = age and x2 = weight. (Round your numerical values to four decimal places.) = (b) If appropriate, carry out a model utility test with a significance level of 0.05 to determine if at least one of the predictors age and weight is useful for predicting home range size. State the null and alternative hypotheses. H0: ?1 = ?2 = 1Ha: at least one of ?1 or ?2 is not 1.H0: At least one of ?1 or ?2 is not 1.Ha: ?1 = ?2 = 1 H0: ?1 = ?2 = 0Ha: at least one of ?1 or ?2 is not 0.H0: At least one of ?1 or ?2 is not 0.Ha: ?1 = ?2 = 0 Calculate the test…
A scale is tested by repeatedly weighing a standard 9.0 kg weight. The weights for 12 measurements are 8.3,9.2,8.3,8.7,8.4,8.3,8.5,8.0,8.4,8.5,8.1,9.3 Determine the mean weight. Give your answer precise to one decimal place. mean:
We asked UST employees to tell us how many megabytes of memory (RAM) they have on their computer. WWe would like to test to see if the mean amount of memory is the same for three different academic departments. We have the memory amounts for six faculty members' machines in the three departments shown below. Dept. 1 Dept. 2 Dept. 3 1 2048 4096 4096 2 2048 2048 4096 3. 2048 2048 8192 computer 4 2048 4096 8192 2048 2048 4096 6. 2048 8192 4096 Here is the ANOVA table: Analysis of Variance Source DF Adj SS Adj MS F-Value P-Value Factor 34952533 17476267 XXX 0.020 Error XX 51030699 3402047 Total XX 85983232 Calculate the value of the F test statistic and enter here:
Each observation in a random sample of 98 bicycle accidents resulting in death was classified according to the day of the week on which the accident occurred. Data consistent with information are given in the following table. x² Day of Week Frequency = Sunday Monday Tuesday Wednesday Thursday Friday Saturday 13 12 12 14 13 18 Based on these data, is it reasonable to conclude that the proportion of accidents is not the same for all days of the week? Use a = 0.05. Calculate the test statistic. (Round your answer to two decimal places.) 16 Use technology to calculate the P-value. (Round your answer to four decimal places.) P-value = State the conclusion in the problem context. O Reject Ho. We have convincing evidence that the proportion of accidents is not the same for all days of the week. O Fail to reject Ho. We have convincing evidence that the proportion of accidents is not the same for all days of the week. ● Fail to reject Ho. We do not have convincing evidence that the proportion…
Make reference to the table below to answer the question that follows: Summary of number of times the child has been placed previously Mean Std. Dev. Freq. physically attacked people never sometimes often Total Source Between groups Within groups 5.5803571 5.9557503 8.7636364 8.7938607 9.8571429 7.8631146 Total 6.9893617 7.2826725 L₂² Analysis of Variance SS df MS 112 55 21 188 F 568.203236 2 284.101618 9349.77549 185 50.539327 9917.97872 187 53.0373194 Bartlett's test for equal variances: chi2(2) = 12.1506 Prob-chi2= 0.002 5.62 Prob > F Does this test violate the assumption of equal variances? 0.0043 O Yes, we are in violation of the assumption of equal variances because p= .002 for Bartlett's test O Yes, we are in violation of the assumption of equal variances because p= .0043 for the difference of means test O No, we are not in violation of the assumption of equal variances because .0043 for the difference of means test No, we are not in violation of the assumption of equal…
Calculate the upper bound of a 95% interval for the sample proportion for the given data (round your answer to 4 decimal places): Population proportion = 70% Number of people from sample who said they play video games = 42 Sample size = 50
A sample of rental cars showed the following annual mileage (in thousands of miles) 46.768 34.813 69.194 36.927 57.666 36.003 42.961 37.194 47.750 41.738 44.239 34.052 31.731 54.661 30.928 47.847 31.286 38.813 40.166 32.905 42.057 49.834 47.556 37.729 22.120 40.822 41.104 62.399 32.550 43.558 8 The sum of x is, a 1147.569 b 1183.061 c 1219.650 d 1257.371
110 adults with gum disease were asked the number of times per week they used to floss before their diagnoses. The (incomplete) results are shown below: # of times floss per week Frequency 0 1 15 2 3 4 5 6 7 5 Relative Frequency 0.1364 0.0454 12 13 14 18 14 19 a. Complete the table (Use 4 decimal places when applicable) 0.1091 0.1182 0.1273 0.1636 0.1273 0.1727 X Cumulative Frequency 32 15 20 45 59 77 91 110

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