2. USA Today reported that the state with the longest mean life span is Hawaii, where the population meanlife span is 77 years. A random sample of 20 obituary notices in the Honolulu Advertizer gave thefollowing information about life span ( in years) of Honolulu residents:72,68,81,93,56,19,78,86,Assuming that life span in Honolulu is approximately normally distributed, does this information indicate that94,47,83,66,84,27,77,69,85,97,75,71,the population mean life span 77 years? Use a 5% level of significance.EXCEL OR SPSS RESULT:I sample meanx (bar) =71.45 sample standard deviation5 sample size7 degress of freedom3 Test statistics:probability value:s= 20.64843565n =v =2019t= -1.212874514p-value= 0.120021383

Answered: 2. USA Today reported that the state…

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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Among fatal plane crashes that occurred during the past 55 years, 336 were due to pilot error, 93 were due to other human error, 204 were due to weather, 601 were due to mechanical problems, and 572 were due to sabotage. Construct the relative frequency distribution. What is the most serious threat to aviation safety, and can anything be done about it?
Suppose that a polling company surveyed 600 people about how much time they spend watching television each day. The results of this survey were compiled and used to create this relative frequency histogram. Assume that all percentages shown in the histogram are whole numbers. Each of the bars in this histogram includes only the left endpoint of the class except for the last bar, which also includes the right endpoint. What percentage of respondents said that they watch television at least six hours per day? How many respondents said that they watch television between three and five hours per day?
A physician recorded the number of seizures that each of 20 patients with severe epilepsy had during an eight-week period. -What are the observational units? -What is probably the population being studied?
The mean number of sick days an employee takes per year is believed to be about 10. Members of a personnel department do not believe this figure. They randomly survey &8 employees. The number of sick days they took for the past year are as follows: 12; 6; 15; 3; 10; 8; 8; 8. Let X= the number of sick days they took for the past year. Should the personnel team believe that the mean number is about 10? Conduct a hypothesis test at the 5% level. What is the test statistic? (If using the z distribution round your answers to two decimal places, and if using the t distribution round your answers to three decimal places.) What is the p-value? (Round your answer to four decimal places.) Construct a 95% confidence interval for the true mean. Sketch the graph of the situation. Label the point estimate and the lower and upper bounds of the confidence interval. (Round your answers to three decimal places.)
Among fatal plane crashes that occurred during the past 55 years, 348 were due to pilot error, 66 were due to other human error, 597 were due to weather, 104 were due to mechanical problems, and 148 were due to sabotage. Construct the relative frequency distribution. What is the most serious threat to aviation safety, and can anything be done about it?
A corporation that maintains a large fleet of company cars for the use of its sales staff is interested in the mean distance driven monthly per sales person. The following table gives the monthly distances in miles driven by a random sample of 15 sales persons: 2560, 2506, 2437, 2476, 2128, 2537, 2023, 2664, 2555, 2552, 2626, 1900, 2691, 1907, 2542 Based on this sample, find a 90% confidence interval for the mean number of miles driven monthly by members of the sales staff, assuming that monthly driving distances are normally distributed. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) What is the lower limit of the confidence Aa interval? What is the upper limit of the confidence interval?
In a sample of employees at a company here were the number of days they were out (sick/personal/vacation days) last year: 1, 6, 19, 35, 5, 9, 8, 12, 2, 15, 7, 7, 11, 15, 0, 25, 20, 15, 19, 5 Using Minitab, find the following sample statistics (take a screenshot of your output from Minitab and paste it here): Mean = median = Standard deviation =IQR=
From the following data set, which stem will have the longest leaf? (3, 6, 8, 8, 10, 13, 13, 15, 17, 19, 20, 24, 26, 26, 26, 31, 35, 37} 00 01 02 3
Among fatal plane crashes that occurred during the past 55 years, 553 were due to pilot error, 79 were due to other human error, 288 were due to weather, 533 were due to mechanical problems, and 111 were due to sabotage. g Construct the relative frequency distribution. What is the most serious threat to aviation safety, and can anything be done about it? --..- Complete the relative frequency distribution below. Relative Cause Frequency % Pilot error Other human error Weather % Mechanical problems % Sabotage % (Round to one decimal place as needed.)
A national newspaper reported that the state with the longest mean life span is Hawaii, where the population mean life span is 76 years. A random sample of 20 obituary notices in the Honolulu Advertizer gave the following information about life span (in years) of Honolulu residents. 72 68 81 93 56 19 78 94 83 84 77 69 85 97 75 71 86 47 66 27 Assuming that life span in Honolulu is approximately normally distributed, does this information indicate that the population mean life span for Honolulu residents is less than 76 years? Use a 10% level of significance. What is the level of significance? What is the value of the sample test statistic? (Round your answer to three decimal places.) Find the P-value. (Round your answer to four decimal places.)
A hypertension trial is mounted, and 12 participants are randomly assigned to receive either a new medication or a placebo. Each participant takes the assigned medication, and the participants’ SBP is recorded after 6 months on the assigned medication. The data are shown in Table 7–9. Is there a difference in mean SBP between treatments? Run the appropriate test at a = 0.05. Placebo New Medication 134 114 143 117 148 121 142 124 150 122 160 128
A group of 320 male students from the local high school have a mean mass of 70.41 kg. Records of similar students countrywide show a mean mass of 70.0 kg. A researcher wishes to determine whether the local students differ from the national group. what would be the research problem?

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