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Study Resources (Statistics)

  38.San Francisco 49ers linebacker Patrick Willis won the Defensive Rookie of the Year Award in 2007 with a total of 174 tackles. Tackles are measured on what kind of a scale? Is a variable measuring the number of tackles considered continuous or discrete?   A.Ratio scale; discrete B.Interval scale; discrete C.Ratio scale; continuous D.Interval scale;.
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  105.A Catholic priest believes that a higher proportion of women in his congregation regularly attend services than the men in his congregation. He randomly selects 100 men and 100 women from his congregation and finds that 32 men and 48 women regularly attend.a. Specify the competing hypotheses to test the.
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  103.The serious delinquency rate measures the proportion of homes that are well behind on their mortgage payments. A real estate investor is trying to decide in which of two neighborhoods in Phoenix to buy an investment property. He is trying to decide if the serious delinquency rate differs between the.
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    21) A large tire manufacturing company has claimed that its top line tire will average more than 80,000 miles. If a consumer group wished to test this claim, they would formulate the following null and alternative hypotheses: H0 : μ ≥ 80,000 Hα : μ ≠ 80,000 Answer:  FALSE 22) A large tire manufacturing.
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  True / False Questions1.Statistical inferences regarding σ2 are based on the F distribution. 2.The population variance is one of the most widely used quantitative measures of risk in investments. 3.The skewness of the Chi-square probability distribution depends on the degrees of freedom.  4.The values of the   distribution range from negative infinity to.
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  81.Exhibit 10.13. A consumer magazine wants to figure out which of two major airlines lost a higher proportion of luggage on international flights. The magazine surveyed Standard Air (population 1) and Down Under airlines (population 2). Standard Air lost 45 out of 600 bags. Down Under airlines lost 30 of.
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    164) Swift is the holding company for Swift Transportation Co., Inc., a truckload carrier headquartered in Phoenix, Arizona. Swift operates the largest truckload fleet in the United States. Before Swift switched to its current computer-based billing system, the average payment time from customers was approximately 40 days. Suppose before purchasing.
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  101.A recent study from the University of California, Berkeley suggests that, compared to white Americans, black Americans are more likely to cross the race barrier in online dating. In a sample of 120 white men, 24 initiated contact with someone outside their race, whereas in a similar sample of 90.
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    154) A recent article in The Wall Street Journal entitled "As Identity Theft Moves Online, Crime Rings Mimic Big Business" states that 39% of the consumer scam complaints by American consumers are about identity theft. Suppose a random sample of 90 complaints is obtained. Of these complaints, 40 were regarding.
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    41) When using the p-value method, the null hypothesis is rejected when the calculated p-value  > α. 42) Generally, it is possible to appropriately test a null and alternative hypotheses using the test statistic approach and reach a different conclusion than would be reached if the p-value approach were used.   43) A.
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  1) Hypothesis testing and confidence interval estimation are essentially two totally different statistical procedures and share little in common with each other.   2) In hypothesis testing, the null hypothesis should contain the equality sign.   3) When the decision maker has control over the null and alternative hypotheses, the alternative hypotheses should be.
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  Essay Questions 51.Philadelphia experienced a record amount of rainfall in August of 2011. During the last week of the month, they received additional rain from a hurricane. Since global warming is thought to cause extreme weather patterns, one conclusion that could be drawn is that these patterns are evidence of global.
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  61.Exhibit 10.8. A new sales training program has been instituted at a rent-to-own company. Prior to the training, 10 employees were tested on their knowledge of products offered by the company. Once the training was completed, the employees were tested again in an effort to determine whether the training program.
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  93.A sports commentator believes that a particular basketball player is just awful in road games but relatively effective at home. To test this claim, the commentator takes a random sample of 36 road games and 49 home games and collects the player's scoring output in each game. He finds that.
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  51.Exhibit 10.5. A producer of fine chocolates believes that the sales of two varieties of truffles differ significantly during the holiday season. The first variety is milk chocolate while the second is milk chocolate filled with mint. It is reasonable to assume that truffle sales are normally distributed with unknown.
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  True / False Questions1.Two random samples are considered independent if the observations in the first sample are different from the observations of the second sample. 2.The difference between the two sample means   is an interval estimator of the difference between two population means   .  3.For a statistical inference regarding   , it.
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  Essay Questions  89.Weather forecasters would like to report on temperatures in Washington, DC. In particular, they would like to compare the temperatures in December to temperatures in January to help potential tourists understand whether there is a difference. The average December temperature in a random sample of 16 days is 35.
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  61.Researchers are interested in completing a study examining trends in the sale of foods in the U.S. They have decided to examine the quantity of organic vegetables sold by supermarkets. Will researchers be able to gather population data?   62.Every 10 years, a census is taken in the U.S. by the Census.
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  Multiple Choice Questions 11.Two or more random samples are considered independent if ____________.  A.The process that generates one sample is the same as the process that generates the other sample B.The process that generates one sample partially overlaps the process that generates the other sample C.The process that generates one sample completely overlaps.
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  True / False Questions 1.A knowledge of statistics provides the necessary tools to differentiate between sound and questionable conclusions.   2.Statistics is the methodology of extracting unnecessary information from a data set.   3.The branch of statistical studies called descriptive statistics summarizes important aspects of a data set.   4.The branch of statistical studies called inferential statistics.
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  Multiple Choice Questions 18.The study of statistics can be defined as   A.The language of data. B.The art and science of getting information from data. C.The study on collecting, analyzing, presenting, and interpreting data. D.All of the above. 19.When reading published statistics (numerical facts), you should _________.   A.Never believe what you read, since all statistics are lies B.Only believe.
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  31.What type of data should be collected when examining a situation in which two candidates running in different elections are being compared in their likelihood of winning their elections?     A.Matched-pairs sampling with qualitative data B.Matched-pairs sampling with quantitative data C.Independent sampling with qualitative data D.Independent sampling with quantitative data 32.You would like to determine.
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  66.Define the measurement scale of a car's fuel efficiency (measured in miles per gallon). Is a car's fuel efficiency discrete or continuous?   67.A study of teen smoking is planned. Researchers are interested in collecting data which allow them to draw conclusions about the likelihood, frequency, and longevity of teen smoking. The.
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  71.A particular bank has two loan modification programs for distressed borrowers: Home Affordable Modification Program (HAMP) modifications, where the federal government pays the bank $1,000 for each successful modification, and non-HAMP modifications, where the bank does not receive a bonus from the federal government. In order to qualify for a.
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  21.In the test for comparing two population means when population variances are unknown and unequal, a student calculates the degrees of freedom using the proper formula as 34.7. How many degrees of freedom should the student assume to find the p-value of the test?     A.34 B.34.7 C.35 D.None of the Above 22.When testing the.
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  75.The following data, drawn from a normal population, is the waiting time (in minutes) of 12 randomly selected customers at a travel desk.1.8, 2.4, 2.7, 2.1, 1.3, 1.7, 1.5, 1.5, 2.3, 2.8, 2.5, 1.9a. Calculate the point estimates of the population variance and the population standard deviation.b. Compute a 90%.
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  28.The estimation of which of the following requires sampling?   A.U.S. unemployment rate B.Total rainfall in Phoenix, Arizona in 2010 C.The Cleveland Indians' hitting percentage in 2010 D.The average SAT score of incoming freshmen at a university 29.A company wants to estimate the mean price of oil over the past 10 years. What kind of data.
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  11.Sampling allows researchers to draw conclusions about the population.   12.A qualitative variable assumes meaningful numerical values.   13.Both discrete and continuous variables may assume an uncountable number of values.   14.A discrete variable cannot assume an infinite number of values.   15.A continuous variable assumes any value from an interval (or collection of intervals).   16.A professor's gender (male,.
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