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Univariate Data ProbabilityExperiments &

Sampling Inference “Random”

Univariate Data100 Points100 Points

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A distribution that has a mean significantly greater than the median would most likely

____________________

A. SymmetricB. Skewed RightC. Skewed LeftD. BimodalE. Uniform

200 Points200 Points

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Univariate Data

A. Standard DeviationB. VarianceC. MeanD. MedianE. Range

Which of the following is most resistant to outliers?


2:001:591:581:571:561:551:541:531:521:511:501:491:481:471:461:451:441:431:421:411:401:391:381:371:361:351:341:331:321:311:301:291:281:271:261:251:241:231:221:211:201:191:181:171:161:151:141:131:121:111:101:091:081:071:061:051:041:031:021:011:000:590:580:570:560:550:540:530:520:510:500:490:480:470:460:450:440:430:420:410:400:390:380:370:360:350:340:330:320:310:300:290:280:270:260:250:240:230:220:210:200:190:180:170:160:150:140:130:120:110:100:090:080:070:060:050:040:030:020:01End

Univariate DataWieland tells you that your quiz grade

was the 90th percentile. If the mean and standard deviation were 77 and 8 respectively, what was your grade?

A. 87B. 90C. 92D. 94E. 97


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Univariate DataUsing the dataset, calculate the mean and

standard deviation.{3, 8, 10, 3, 12, 10}

A. (7.5, 3.5)B. (7.6, 3.5)C. (7.6, 12.3)D. (7.6, 4.0)E. (8.0, 4.0)


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Univariate DataWhich of the statements is true about standard

deviation?I.It depends on the mean

II.It is a measure of spreadIII.It is not resistant to outliers

A. I & IIB. I & IIIC. II & IIID. I, II, & IIIE. None


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ProbabilityThe probability of Jason serving an ace in tennis is 0.15, and the probability that he

double faults is 0.25. What is the probability that he doesn’t serve an ace or double fault?

A. 0.4B. 0.45C. 0.5D. 0.55E. 0.6


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ProbabilityWhat is the probability that you and your friend choose the same number between

1 and 20 inclusive?

A. 0.5B. 0.05C. 0.053D. 0.005E. Cannot be determined


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ProbabilityThe probability of randomly choosing

someone who is left handed is 0.1. In a group of 15 people, what is the

probability that 2 are left handed?A. 0.267B. 0.346C. 0.549D. 0.621E. 0.816


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Bivariate DataThe average height of a senior boy is 5’8” with a standard deviation of 3”. The average height of a senior girl is 5’4” with a standard deviation of 2”.

When paired up for graduation, what is the probability that the girl is taller than the boy?

A. 0.032B. 0.084C. 0.134D. 0.189E. 0.212


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ProbabilitySuppose that 62% of the graduates from a HS go on to 4 yr colleges, 15% go on to 2 yr colleges, 18% find a job, and the remaining graduates search for a job. If a

randomly selected student is not going to a 4 yr college, what is the probability that he/she will find

employment.A. 0.440B. 0.474C. 0.526D. 0.545E. 0.560


2:001:591:581:571:561:551:541:531:521:511:501:491:481:471:461:451:441:431:421:411:401:391:381:371:361:351:341:331:321:311:301:291:281:271:261:251:241:231:221:211:201:191:181:171:161:151:141:131:121:111:101:091:081:071:061:051:041:031:021:011:000:590:580:570:560:550:540:530:520:510:500:490:480:470:460:450:440:430:420:410:400:390:380:370:360:350:340:330:320:310:300:290:280:270:260:250:240:230:220:210:200:190:180:170:160:150:140:130:120:110:100:090:080:070:060:050:040:030:020:01End

InferenceIf you and a friend both randomly choose

a number between 1 and 20 inclusive, what is the probability that you pick the

same number?

A. 0.5B. 0.05C. 0.053D. 0.005E. Cannot be determined


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Experiments/SamplingThe purpose of blocking in experimental

design is to ___________ Hint: matched pair is a type of blocking

A. Control for confounding variables

B. Control for experimenter biasC. Replicate the experimentD. Control for lurking variablesE. Incorporate blinding


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Experiments/SamplingMr. DeMaio wants to collect a sample of 50 PV

students. To keep the sample proportions equal to the population proportions, he samples 12 seniors, 14 juniors, 13 sophomores, & 11 freshmen. What type

of sampling method was used?A. Simple RandomB. SystematicC. StratifiedD. ClusterE. Convenience


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Experiments/SamplingWhich of the statements describes good practices

when designing experiments?I.Control the effects of confounding variables

II.Replicate to increase variation from treatmentsIII.Randomize to ensure that an effect is observed.

A. I onlyB. I and IIC. I and IIID. II onlyE. I, II, and III


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Experiments/SamplingWhich of the following best describes the goal of

sampling?I.Produce an average sample

II.Choose the average representativesIII.Produce a representative sample

A. I onlyB. II onlyC. I & IID. III onlyE. I and III


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InferenceIf all other values are held constant, which of the following is true of a

confidence interval if the sample size is increased?

A. The margin of error will decreaseB. The sample mean will increaseC. The margin of error will increaseD. The population mean will increaseE. The sample variability will decrease

Inference200 Points200 Points

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In a survey of 550 students, 260 stated that they had worked during the summer break. In the same survey last year, 300 of 610 stated the same.

Which type of test should be used to determine if the difference is statistically significant?

A. A matched pair t testB. A one sample t testC. A 1 proportion z testD. A 2 sample t testE. A 2 proportion z test


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The mean weight of 120 male high school students is 156 lbs with a standard deviation of 23 lbs.

Which test should be used to determine whether the mean weight of all high school seniors is more than

150 lbs?

A. A matched pair t testB. A one sample t testC. A 1 proportion z testD. A 2 sample t testE. A 2 proportion z test


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Which of the following statements is true?I.The null hypothesis is stated in terms of a population

paramenterII.The alternative hypothesis is stated in terms of a sample

statisticIII.The larger the p-value the weaker the evidence against

the null hypothesis

A. I & II B. I & IIIC. III onlyD. I, II, & IIIE. None


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“Random”100 Points100 Points

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A 95% confidence interval for the true slope of a regression line is (-3.38,-0.936). Which of the following is the point estimate for the

slope?

A. -0.936B. -2.157C. -2.442D. -3.378E. -4.314


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Students are comparing the grade distributions of three professors who teach the same course.

Which test would they employ?

A. Chi Square test for independenceB. Chi Square test for goodness of fitC. Chi Square test for homogeneityD. t-testE. None of the above


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A researcher wishes to study the effects of diet on weight loss. He recruits 60 overweight subjects to participate in the study

and records their gender. He also randomly assigns three different diet and exercise regimens to the subjects. Which of

the following describes appropriate blocking techniques?

A. Block on genderB. Block on dietC. Block on exerciseD. Both B & CE. A, B, & C


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Which of the following statements are true?I.The range of the sample data set can never be

greater than the range of the population.II.While the range is affected by outliers, the

interquartile range is not.III.Changing the order from ascending to descending

changes the sign of the range.A. I onlyB. II onlyC. III onlyD. I and IIE. I and III


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Increasing your sample size in a hypothesis test:I. Decreases the probability of a Type I ErrorII.Decreases the probability of a Type II Error

III.Increases the Power of the test

A. I onlyB. II onlyC. I & IIID. II & IIIE. I, II, & III

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