EBook Problems EDA Var - Revision history

Tdlee: Text replacement - "{{translate|pageName=http://wiki.stat.ucla.edu/socr/" to ""{{translate|pageName=http://wiki.socr.umich.edu/"

2020-03-03T19:04:29Z

Text replacement - "{{translate|pageName=http://wiki.stat.ucla.edu/socr/" to ""{{translate|pageName=http://wiki.socr.umich.edu/"

2009-01-08T19:52:55Z

2009-01-08T08:57:41Z

2009-01-04T00:57:11Z

2009-01-04T00:50:54Z

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← Older revision		Revision as of 19:04, 3 March 2020
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	* SOCR Home page: http://www.socr.ucla.edu		* SOCR Home page: http://www.socr.ucla.edu

−	{{translate\|pageName=http://wiki.~~stat~~.~~ucla~~.edu~~/socr~~/index.php/EBook_Problems_EDA_Var}}	+	"{{translate\|pageName=http://wiki.socr.umich.edu/index.php/EBook_Problems_EDA_Var}}

@@ Line 121: / Line 121: @@
 :''(e) 0.67 seconds
 {{hidden|Answer|(d)}}
 <hr>

← Older revision		Revision as of 08:57, 8 January 2009
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	{{hidden\|Answer\|(c)}}		{{hidden\|Answer\|(c)}}

		+	===Problem 8===
		+	Avoiding an accident while driving can depend on reaction time. That time, measured from the moment a driver first sees the danger until he or she gets his or her foot on the brake pedal, is thought to follow the Normal Model with mean = 1.50 seconds and standard deviation = 0.18 seconds.
		+	Determine the closest value for the interquartile range for reaction times.
		+
		+	*Choose one answer.
		+
		+	:''(a) 1.62 seconds
		+
		+	:''(b) 1.38 seconds
		+
		+	:''(c) We cannot determine the statistics unless we have the actual data
		+
		+	:''(d) 0.24 seconds
		+
		+	:''(e) 0.67 seconds
		+	{{hidden\|Answer\|(d)}}

	<hr>		<hr>

@@ Line 90: / Line 90: @@
 :''(d) Weight at birth because weights of infants vary considerably from baby to baby.
 {{hidden|Answer|(b)}}
 <hr>

← Older revision		Revision as of 00:50, 4 January 2009
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	:''(e) The test was too hard for this class		:''(e) The test was too hard for this class
		+	{{hidden\|Answer\|(b)}}
		+
		+	===Problem 6===
		+	A health study follows a large random sample of children from the time they are born until they are 20 years old. Each year, a variety of measurements are taken. For example, their weight is measured at birth and every year thereafter.
		+
		+	Which sample of measurements will have the largest standard deviation: weight at birth or weight at 16 years old?
		+
		+	*Choose one answer.
		+
		+	:''(a) Both should have about the same standard deviation since both samples include the same people.
		+
		+	:''(b) Weight at 16 years old because there is less variation among infants.
		+
		+	:''(c) We cannot tell without knowing the means of both samples.
		+
		+	:''(d) Weight at birth because weights of infants vary considerably from baby to baby.
	{{hidden\|Answer\|(b)}}		{{hidden\|Answer\|(b)}}

← Older revision		Revision as of 21:42, 3 January 2009
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	:''(d) No, because the standard deviation is only measuring how the values differ from each other		:''(d) No, because the standard deviation is only measuring how the values differ from each other
		+	{{hidden\|Answer\|(b)}}
		+
		+	===Problem 5===
		+	A 30 item math test was graded using the following procedure: a correct response was scored as +1, a blank response was scored 0, and an incorrect response was scored -1. The maximum possible test score was 30; the lowest score possible was -30. The standard deviation of the test scores for the class was reported to be -2.13. Therefore
		+
		+	*Choose one answer.
		+
		+	:''(a) Most students received positive scores
		+
		+	:''(b) A calculation error was made in determining the standard deviation
		+
		+	:''(c) Some students received negatives scores
		+
		+	:''(d) The class performed poorly on this test
		+
		+	:''(e) The test was too hard for this class
	{{hidden\|Answer\|(b)}}		{{hidden\|Answer\|(b)}}

← Older revision		Revision as of 21:39, 3 January 2009
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	:''(d) It will not change		:''(d) It will not change
		+	{{hidden\|Answer\|(b)}}
		+
		+	===Problem 4===
		+	Does the size of the standard deviation of a data set depend on where the center is?
		+
		+	*Choose one answer.
		+
		+	:''(a) Yes, the higher the mean, the higher the standard deviation
		+
		+	:''(b) Yes, because you have to know the mean to calculate the standard deviation
		+
		+	:''(c) No, the value of the standard deviation is not affected by the value of the mean
		+
		+	:''(d) No, because the standard deviation is only measuring how the values differ from each other
	{{hidden\|Answer\|(b)}}		{{hidden\|Answer\|(b)}}

← Older revision		Revision as of 07:46, 3 January 2009
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	:''(d) Both boxplots will be skewed, in the case of males the median line will be close to the top of the box and for the females the median line will be closer to the bottom of the box.		:''(d) Both boxplots will be skewed, in the case of males the median line will be close to the top of the box and for the females the median line will be closer to the bottom of the box.
		+	{{hidden\|Answer\|(b)}}
		+
		+	===Problem 3===
		+	If the observations larger than 40 are deleted, what will happen to the value of the standard deviation?
		+
		+	*Choose one answer.
		+
		+	:''(a) It will become larger
		+
		+	:''(b) It will become smaller
		+
		+	:''(c) Need more information to answer this question
		+
		+	:''(d) It will not change
	{{hidden\|Answer\|(b)}}		{{hidden\|Answer\|(b)}}

@@ Line 16: / Line 16: @@
 :''(e) sampling distribution of the variance
 {{hidden|Answer|(d)}}
 <hr>

← Older revision		Revision as of 06:24, 4 December 2008
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	:''(e) sampling distribution of the variance		:''(e) sampling distribution of the variance
	{{hidden\|Answer\|(d)}}		{{hidden\|Answer\|(d)}}
		+
		+	<hr>
		+	* [[EBook \| Back to Ebook]]
		+	* SOCR Home page: http://www.socr.ucla.edu
		+
		+	{{translate\|pageName=http://wiki.stat.ucla.edu/socr/index.php/EBook_Problems_EDA_Var}}