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Exam 4: Descriptive Statistics

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Question 31

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The following table is the frequency distribution of parking fees for a day: What is the mean parking fee?

A) $7.07
B) $6.95
C) $7.00
D) $7.25

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Question 32

Multiple Choice

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So far this year,stock A has had a mean price of $6.58 per share with a standard deviation of $1.88,while stock B has had a mean price of $10.57 per share with a standard deviation of $3.02.Which stock is more volatile?

A) Stock A
B) Stock B
C) They are the same.

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Question 33

Multiple Choice

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Exam scores in a small class were 10,10,20,20,40,60,80,80,90,100,100.For this data set,which statement is incorrect concerning measures of center?

Twelve randomly chosen students were asked how many times they had missed class during a certain semester,with this result: 2,1,5,1,1,3,4,3,1,1,5,18.For this sample,the geometric mean is

Which is not a measure of variability?

Five homes were recently sold in Oxnard Acres.Four of the homes sold for $400,000,while the fifth home sold for $2.5 million.Which measure of central tendency best represents a typical home price in Oxnard Acres?

The quartiles of a distribution are most clearly revealed in which display?

Based on daily measurements,Bob's weight has a mean of 200 pounds with a standard deviation of 16 pounds,while Mary's weight has a mean of 125 pounds with a standard deviation of 15 pounds.Who has the smaller relative variation?

If the mean and median of a population are the same,then its distribution is

Find the standard deviation of this sample: 4,7,9,12,15.

Bob's sample of freshman GPAs showed a mean of 2.72 with a standard deviation of 0.31.(a)What range would you predict for all the grades? For the middle 95 percent? Explain.(b)Why might your estimates be inaccurate?

If there are 19 data values,the median will have 10 values above it and 9 below it since n is odd.

The following frequency distribution shows the amount earned yesterday by employees of a large Las Vegas casino.Estimate the mean daily earnings.

The 25th percentile for waiting time in a doctor's office is 10 minutes.The 75th percentile is 30 minutes.Which is incorrect regarding the fences?

The sum of the deviations around the mean is

When applying the Empirical Rule to a distribution of grades,if a student scored one standard deviation below the mean,then she would be at the 25th percentile of the distribution.

Which of the following statements is likely to be true?

In Tokyo,construction workers earn an average of ¥420,000 (yen) per month with a standard deviation of ¥20,000,while in Hamburg,Germany,construction workers earn an average of €3,200 (euros) per month with a standard deviation of €57.Who is earning relatively more,a worker making ¥460,000 per month in Tokyo or one earning €3,300 per month in Hamburg?

When data are right-skewed,we expect the median to be greater than the mean.

Ten randomly chosen students at a certain university were asked how many times they smoked marijuana during the preceding week.Their answers were 0,8,0,0,2,4,0,0,6,0.A campus newspaper article appeared,with the headline "Average Student Uses No Pot." Is this a fair assessment of central tendency? Discuss the alternatives.