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Study Resources (Statistics)

  FREE RESPONSE QUESTIONS 11.{Boat show narrative} Specify who/what the units are in this study. 12.{Boat show narrative} Specify the population. 13.{Boat show narrative} Specify the sample. 14.{Boat show narrative} Is there a practical and accurate way to get a sampling frame for this population? If yes, explain how. If no, explain why not. Multiple Choice.
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  FREE RESPONSE QUESTIONS 31.A psychology student conducts a study to measure the amount of motivation students have for their math courses. She hands out a survey in every math class at her school on the day before spring break. What is the problem with her sampling process? 32.A social worker wants to.
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    MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question. 84) The June precipitation (in inches) for 10 randomly selected cities are listed below. Construct a 90% confidence interval for the population standard deviation, σ. Assume the data are normally distributed. 2.0    3.2    1.8    2.9    0.9   .
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  MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question. 113) A local tennis pro-shop strings tennis rackets at the tension (pounds per square inch) requested by the customer. Recently a customer made a claim that the pro-shop consistently strings rackets at lower tensions, on.
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  FREE RESPONSE QUESTIONS 21.Give three major advantages to using a (well designed and conducted) sample survey rather than a census. 22.With a random sample of 2,500 people, we usually get an estimate that is accurate to within what percent of the truth (using the general rule)? 23.Suppose you sampled 2,500 people for a.
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    FREE RESPONSE QUESTIONS   21.Explain why you cannot make causal connections with an observational study.   For Questions 22-23, use the following narrative Researchers at the University of Iowa College of Medicine reported that a test showed those who smoked seven or more marijuana joints per week had lower math scores than non-marijuana users.  A.
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    MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question. 132) The amount of corn chips dispensed into a 16-ounce bag by the dispensing machine has been identified as possessing a normal distribution with a mean of 16.5 ounces and a standard deviation of 0.2.
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  FREE RESPONSE QUESTIONS 25.When you read about measurements taken by someone else, you should not assume that they are measuring things the same way you think they should be measured. Give an example from the media where this problem might come up. 26.Why do IQ tests continue to be surrounded by controversy.
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  160) According to a prestigious historical society, in 1999, 7.2% of recent high school graduates believe that the Romans invented mayonnaise. A classics scholar believes that the percentage has increased since then. He randomly selects 125 recent high school graduates and finds that 17 of them believe in the Roman.
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  FREE RESPONSE QUESTIONS 15.Suppose you want to set up a survey involving only closed questions. Why is it important to first conduct a pilot survey involving open questions? 16.Name one of the major problems with offering open questions on a survey. 17.Explain why it is important as a consumer of statistical information to.
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  193) True or False:  Results that are practically significant will always be statistically significant.  193) _____ A) False B) True   Find the critical value(s). 194) Determine the critical value for a right-tailed test of a population standard deviation with 22 degrees of freedom at the level of significance. 194).
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    SHORT ANSWER.  Write the word or phrase that best completes each statement or answers the question. Provide an appropriate response. 10) When 440 junior college students were surveyed, 200 said they have a passport. Construct a 95% confidence interval for the proportion of junior college students that have a passport..
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  FREE RESPONSE QUESTIONS 11.Give one example of where a news story involving a statistical study can originate. 12.What is one of the problems with news stories based on conference presentations? 13.One source of news stories about statistical studies involves in-depth research reports provided by government and private agencies. Name one disadvantage of these.
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  FREE RESPONSE QUESTIONS 21.Your book lists three major reasons that studies are conducted. Name one of them. 22.Explain why it is important to find out not only who conducted a study, but also who funded the study. 23.In the case of a cola taste test, explain why it is important that both the.
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    218) A brokerage firm needs information concerning the standard deviation of the account balances of its customers. From previous information it was assumed to be $250. A random sample of 61 accounts was checked. The standard deviation was $286.20. At α = 0.01, test the firm's assumption. Assume that the.
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  FREE RESPONSE QUESTIONS 41.{Supermarket pricing narrative}Suppose you are approached by one of the supermarkets and they said they would fund your study if they would be allowed to select the products for price comparison. Which of the seven critical components of a good study is at issue here? 42.{Supermarket pricing narrative}What are.
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FREE RESPONSE QUESTIONS   1.Name one way in which the study of statistics is useful for every day life.   2.Statistics is about collecting information and using it to help you make a decision. Give an example of a decision that could be made using statistics.   3.Name one way that you have used statistics in.
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  FREE RESPONSE QUESTIONS 35.Give an example of a measurement that is reliable but not valid. 36.What is measurement error? 37.Explain the following statement: “The more variability there is within each group, the more difficult it is to detect a difference between groups.” 38.Give three reasons why variability across measurements can occur. Multiple Choice QUESTIONS 39.Which of.
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FREE RESPONSE QUESTIONS 1.Name one way in which you can encounter stories whose conclusions are based on data. 2.One of the goals of this course is to help you become an educated consumer of data. Name one way in which you ‘consume’ data. 3.Explain briefly what it means to be an educated consumer.
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FREE RESPONSE QUESTIONS 1.Explain why even the simplest kind of measurement, such as finding your height, still presents complicated issues. 2.Describe one of the issues that you would need to think about when deciding how to measure which supermarket is the ‘best’ one in town. Multiple Choice QUESTIONS 3.What can happen if you don’t.
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FREE RESPONSE QUESTIONS 1.What is the most important advantage of using a randomized experiment vs. an observational study, in terms of the statistical results? 2.Name one advantage that observational studies have over experiments. 3.What is the most important limitation of a case study? 4.Why do researchers conduct experiments that are randomized (that is, participants.
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  MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question. Provide an appropriate response. 1) When 385 junior college students were surveyed,170 said that they have previously owned a motorcycle. Find a point estimate for p, the population proportion of students who have previously owned.
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    SHORT ANSWER.  Write the word or phrase that best completes each statement or answers the question. 94) The table shows the monthly rents (in dollars) for 10 studio apartments selected randomly from all studio apartments in one city.  950        840        1330     1020      1180 880       990          760         1250              825 Explain the algorithm in using the bootstrap.
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  FREE RESPONSE QUESTIONS   11.Explain the difference between the statistical terms ‘population’ and ‘sample'.   12.Suppose you want to determine whether taking vitamins every day helps people lose weight. You survey 200 people who had been on a weight loss program for six months, and ask them whether or not they take vitamins every.
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