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Statistics and Data AnalysisFinal Exam Review Part 1Sampling and Surveys 100 Answer: CIn a recent poll, adults were asked how many cell phones they had owned in their lifetime. The variable being measured is

the number of adults polledthe number of adults with cell phonesthe number of cell phones a person has ownedThe number of cell phones a person owns right nowthe age of the person surveyedCenter and Spread - 100Answer: DThe 11 states in the Midwest have these percents of obese adults:

19.5 19.5 17.9 20.7 17.9 15.7 19.3 19.8 18.7 15.4 17.5

The mean and standard deviation of these values are about:

18.35 and 1.6018.35 and 201.918.35 and 3733.9318.35 and 1.6818.35 and 11Normal Distributions - 100Answer: CWhat is the standard score for an observational value of 49 from a distribution with mean 32 and standard deviation of 12?

46.333 1.417 1.417 46.333Graphs - 200Which point on this boxplot is the first quartile of the distribution?

Answer: BNormal Distributions - 200Answer: AThe weights of male Doberman Pinschers is normally distributed with a mean of 77 lbs. and a standard deviation of 4.3 lbs. What proportion of male Doberman Pinschers weigh less than 65 lbs.?

0.00260.99740.49740.0508Center and Spread - 200Answer: DFifty percent of the observations will be at or above the

maximumstandard deviationmeanmedianfirst quartileSampling and Surveys - 200 Answer: DA quality control inspector wants to check the quality of the coffee beans being produced. He goes to each of 10 batches of beans that had been roasted that day and takes a random cupful of coffee beans to be used for testing. This is an example of which kind of sampling method?

Simple Random SamplingSystematic Random SamplingVoluntary ResponseStratified Random SamplingBlockingExperiments and Studies - 200Which of the following is not a principal of experimental design?

ControlRandomizationReplicationBlockingUsing many subjects to reduce chance variation

Answer: D Graphs - 300

We see from the plot that the median number of calories in a beef hot dog is about190 179 153 139 129Answer: CExperiments and Studies - 300Researchers interested in the effects of a new drug to help people quit smoking wonder whether or not a person is depressed would affect the outcome. They enlist 300 subjects without depression and 140 subjects with depression. Within each group they randomly assign each person the new drug or a placebo. They then record whether the person was able to quit smoking successfully. Breaking the subjects into two groups first is an example of:

RandomizationStratifyingBlockingReplicationSystematic SamplingAnswer: CSampling and Surveys - 300Answer: EAn environmental watchdog group posted on their website a survey question asking readers to answer the following question, "Given the recent oil spill in the Gulf of Mexico and the subsequent environmental disaster, should we continue to allow oil companies to plunder and destroy the ocean depths for oil?" The results of this survey may not be accurate because of

Nonsampling errorUndercoverageWording of the QuestionVoluntary Response BiasAll the aboveCenter and Spread - 300Answer: C189284296312325368369369389625Using the 1.5IQR Rule, identify any outliers.

189189 and 625625There are no outliersWe cant use the 1.5IQR rule because the data set is small.Normal Distributions - 300Answer: AThe weights of male Doberman Pinschers is normally distributed with a mean of 77 lbs. and a standard deviation of 4.3 lbs. What proportion of male Doberman Pinschers are between 68 and 79 lbs.?

0.66090.48180.33050.2567

Graphs - 400

The mean is

less than the median because the distribution is skewed leftgreater than the median because the distribution is skewed leftless than the median because the distribution is skewed rightequal to the medianimpossible to determineAnswer: AExperiments and Studies - 400Answer: CThe difference between an experiment and an observational study is

Observational studies don't have explanatory and response variables.Experiments don't have placebos.An experiment imposes treatments on subjects, while an observational study measures variables of interest without attempting to influence responses.Experiments are double-blind, while observational studies are only single-blind.All of the above.Sampling and Surveys - 400Answer: CWhen we take a census, we collect data from

a stratified random sampleevery individual selected in a simple random sampleevery individual in the populationa voluntary response samplea convenience sampleCenter and Spread - 400Answer: BIf a set of observations has a standard deviation that is zero, which of the following must be true?

The mean is also zero.All the values are exactly the same.There is no relationship between the observations.The standard deviation can never be zero.The data is skewed.Normal Distributions - 400Answer: CThe weights of male Doberman Pinschers is normally distributed with a mean of 77 lbs. and a standard deviation of 4.3 lbs. What would be the lowest weight of the top 10% of Doberman Pinschers?

80 lbs85.6 lbs82.5 lbs90 lbsGraphs - 500Answer: B

Which of the following best describes the given stemplot?

Skewed right, use the mean and standard deviation to describe the dataSkewed right, use the 5 number summary to describe the dataSkewed left, use the mean and standard deviation to describe the dataSkewed left, use the 5 number summary to describe the dataSymmetric, use either summary to describe the data

Experiments and Studies - 500Answer: EA magazine article on preventing cancer says, "Eating one serving of tofu a week may cut your risk of breast cancer 15 percent, recent research suggests." If the data comes from an observational study, then

the results must be false.the results must be true.there may be lurking variables.perhaps those who choose to eat more tofu are, for some reason, less susceptible to breast cancer than those who didn't.Both (c) and (d) are true.Sampling and Surveys - 500 Answer: DA political polling group took a simple random sample of a 250 residents of a large city asking if they would be voting for the Republican or Democratic candidate in the upcoming election for mayor. They found that 130 would be voting for the Democrat. The group reported that 52% of the voters would be voting for the Democratic candidate for mayor. The actual result was that 58% voted for the Democratic candidate. Which of the following is correct?

The 52% and 58% are both parametersThe 52% and 58% are both statisticsThe 52% is a parameter; the 58% is a statisticThe 52% is a statistic; the 58% is a parameterIt is impossible to tell which is a parameter or statistic

Center and Spread - 500Answer: CA set of observations has a mean of 145 and a standard deviation of 32. If each observation has 15 added to it's value what would happen to the mean and standard deviation?

They would both stay the same.Both statistics would increase by 15. Only the mean would increase by 15; the standard deviation would stay the same.Only the standard deviation would increase by 15; the mean would stay the same.It is impossible to figure out without having the actual data.Daily Double!Normal Distributions - 500Answer: AThe weights of male Doberman Pinschers is normally distributed with a mean of 77 lbs. and a standard deviation of 4.3 lbs. Find the IQR of weights.

5.8 lbs.6.0 lbs. 74.1 lbs79.9 lbsMerv GriffinJeopardy!128919.055