Module 9 1-9 Review HW Quiz Final.docx - STAT 211 Module 9...

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STAT 211 Module 9 HW Quiz Final When testing a new treatment, what is the difference between statistical significance and practical significance? Can a treatment have statistical significance, but not practical significance? Statistical significance is achieved when the result is very unlikely to occur by chance. Practical significance is related to whether common sense suggests that the treatment makes enough of a difference to justify its use. It is possible for a treatment to have statistical significance, but not practical significance. What is the goal of statistics? To learn to distinguish between statistical conclusions that are likely to be valid and those that are seriously flawed. Determine whether the underlined number is a statistic or a parameter. A sample of employees is selected and it is found that 40% own a vehicle. Statistic because the value is a numerical measurement describing a characteristic of a sample. Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate for the data below. Diameter of circles in inches. The ratio level of measurement is most appropriate because the data can be ordered, differences (obtained by subtraction) can be found and are meaningful and there is a natural starting zero point. Identify the type of sampling used (random, systematic, convenience, stratified, or cluster sampling) in the situation described below. In a poll conducted by a certain research center, 1081 adults were called after their telephone numbers were randomly generated by a computer, and 38% were able to correctly
Among fatal plane crashes that occurred during the past 70 years, 408 were due to pilot error, 60 were due to other human error, 605 were due to weather, 106 were due to mechanical problems, and 119 were due to sabotage. Construct the relative frequency distribution. What is the most serious threat to
46.6%, Mechanical problems 8.2%, Sabotage 9.2%. Weather is the most serious threat to aviation safety. Weather monitoring systems could be improved. Natural births randomly selected from four hospitals in a highly populated region occurred on the days of the week (in the order of Monday through Sunday) with the frequencies 53, 63, 72, 59, 57, 43, 53. Does it appear that such births occur on the days of the week with equal frequency? Monday 13.25%, Tuesday 15.75%, Wednesday 18%, Thursday 14.75%, Friday 14.25%, Saturday 10.75%, Sunday 13.25%.
Heights of adult males are normally distributed. If a large sample of heights of adult males is randomly

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