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qmb 3250 exam 1 QUESTIONS WITH VERIFIED ANSWERS
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qmb 3250 exam 1 QUESTIONS WITH VERIFIED ANSWERS
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qmb 3250 exam 1 QUESTIONS WITHVERIFIED ANSWERS
What is a response variable? - ANSWER: ➡ what the study is trying to determine
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To look at the relationship between Serum 25(OD)D levels and location(urban/rural), what
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type of graph might you use? - ANSWER: ➡ boxplot
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A histogram is a graphical display to show _________ . - ANSWER: ➡ the outcomes of a
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quantitative variable.
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What is the primary purpose of the 95% confidence interval for μ2-μ1 ? - ANSWER: ➡ To
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estimate the difference between the mean of population 1 and population 2. The Confidence
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Interval for two independent means is interested in estimating the difference between the
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parameters.
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In significance testing, what does α represent? - ANSWER: ➡ The probability of a Type I error
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what type of statistical test should be used to determine are older people more likely than
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younger people to consider purchasing a hybrid vehicle? - ANSWER: ➡ Comparing two
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independent proportions
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categorical data - two groups o o o o
what type of statistical test should be used to determine what is the typical price of a used
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Toyota Prius manufactured in 2011? - ANSWER: ➡ One Mean
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quantitative data - one group o o o o
what type of statistical test should be used to determine if there is a difference in used car price
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for a Toyota Prius with 2 or 4 cylinders? - ANSWER: ➡ Comparing two independent means
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, quantitative data - two groups o o o o
what type of statistical test should be used to determine if there is a significant difference in gas
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mileage for a Toyota Prius driven 100 miles in the mountains versus along a flat coastline? Ten
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drivers determine their gas mileage for the same stretch of roads in the mountains and along
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the flat coastline. - ANSWER: ➡ Comparing means of dependent samples
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quantitative data - paired responses o o o o
what type of statistical test should be used to determine what proportion of people purchase a
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hybrid cars after they have been given a test drive? - ANSWER: ➡ One Proportion
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categorical data - one group o o o o
In the past the average life span for a flashlight battery has been 10 hours. However, the
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production line has been improved in the past six months. The manufacturer wants to
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determine if the lifetime of the battery has improved. The manufacturer tested the lifetimes of
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25 batteries. What would be the appropriate hypothesis to test this claim? - ANSWER: ➡ Ho: μ
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=10 versus Ha: μ >10
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In the past the average life span for a flashlight battery has been 10 hours. However, the
o o o o o o o o o o o o o o o o
production line has been improved in the past six months. The manufacturer wants to
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determine if the lifetime of the battery has improved. The manufacturer tested the lifetimes of
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25 batteries. What is the parameter being estimated? - ANSWER: ➡ μ = population mean
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lifetime of the battery
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For the hypothesis Ho: μ1-μ2=0 versus Ha: μ1-μ2≠0, the p-value equals 0.021. Let α = 0.05.
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What decision would be made here? If an error is made here, what type of error would it be? -
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ANSWER: ➡ Reject Ho
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Rule: p-value ≤ α Reject Ho The p-value = 0.021 < α = 0.05
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Type I error since we rejected Ho, the only type of error that we could make if we made an error
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would be Type I error. The definition of a type 1 error is the error that occurs when we reject Ho
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when Ho is true.
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type 1 error - ANSWER: ➡ is the error that occurs when we reject Ho when Ho is true
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