EBook Problems Normal Critical - Revision history

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

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

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← Older revision		Revision as of 19:30, 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_Normal_Critical}}	+	"{{translate\|pageName=http://wiki.socr.umich.edu/index.php/EBook_Problems_Normal_Critical}}

← Older revision		Revision as of 00:09, 9 January 2009
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	:''(e) Relative to other students, Wanda did better in calculus.		:''(e) Relative to other students, Wanda did better in calculus.
		+	{{hidden\|Answer\|(b)}}
		+
		+	===Problem 16===
		+	Suppose that the heights of college women are nearly normal with mean = 65 inches and deviation = 2.0 inches. If talented gymnast Vanessa is at the 10th percentile in height for college women, determine Vanessa's height.
		+
		+	*Choose one answer.
		+
		+	:''(a) 60.50 inches
		+
		+	:''(b) 62.44 inches
		+
		+	:''(c) 62.00 inches
		+
		+	:''(d) 64.50 inches
		+
		+	:''(e) Cannot be determined without the data
	{{hidden\|Answer\|(b)}}		{{hidden\|Answer\|(b)}}

← Older revision		Revision as of 00:03, 9 January 2009
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	:''(e) Only 1.5% of women who are Gillian's age have a higher systolic blood pressure.		:''(e) Only 1.5% of women who are Gillian's age have a higher systolic blood pressure.
	{{hidden\|Answer\|(d)}}		{{hidden\|Answer\|(d)}}
		+
		+	===Problem 15===
		+	Suppose that the scores on the chemistry final exam are nearly normal with mean of 75 and standard deviation of 12. The scores of the calculus final are also nearly normal with mean of 80 and deviation of 8. Wanda scores 81 on the chemistry exam and 84 on calculus final. Relative to other students in each course, how did Wanda compare?
		+
		+	*Choose one answer.
		+
		+	:''(a) There is not enough information for comparison, because the number of students in each class is not known.
		+
		+	:''(b) Relative to other students, Wanda did equally well on both exams.
		+
		+	:''(c) Relative to other students, Wanda did better in chemistry.
		+
		+	:''(d) There is no basis for comparison, since the subjects are different and in different departments.
		+
		+	:''(e) Relative to other students, Wanda did better in calculus.
		+	{{hidden\|Answer\|(b)}}

← Older revision		Revision as of 19:55, 8 January 2009
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	:''(d) 70.25 inches		:''(d) 70.25 inches
	{{hidden\|Answer\|(c)}}		{{hidden\|Answer\|(c)}}
		+
		+	===Problem 14===
		+	During a recent physical, Gillian's doctor told her that the standardized score (z-score) for her systolic blood pressure, as compared to the blood pressure of other women her age, was 1.50. Which of the following is the best interpretation of this standardized score?
		+
		+	*Choose one answer.
		+
		+	:''(a) Gillian's systolic blood pressure is 150
		+
		+	:''(b) Gillian's blood pressure is 1.50 above the mean systolic blood pressure for women her age
		+
		+	:''(c) Gillian's systolic blood pressure is 1.50 times the mean systolic blood pressure for women her age.
		+
		+	:''(d) Gillian's systolic blood pressure is 1.50 standard deviations above the mean systolic blood pressure for women her age.
		+
		+	:''(e) Only 1.5% of women who are Gillian's age have a higher systolic blood pressure.
		+	{{hidden\|Answer\|(d)}}

← Older revision		Revision as of 07:17, 8 January 2009
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	:''(d) 25 dogs		:''(d) 25 dogs
	{{hidden\|Answer\|(a)}}		{{hidden\|Answer\|(a)}}
		+
		+	===Problem 12===
		+	Comparing Z-scores
		+	Which of the following statements about z-scores is true?
		+
		+	A: yA = 25.4 with mean = 12.9 and deviation = 3.7 or
		+	B: yB = 137.5 with mean = 72.7 and deviation = 21.1
		+
		+	*Choose one answer.
		+
		+	:''(a) ZA is larger
		+
		+	:''(b) We cannot compare z-scores since the distributions are not normal
		+
		+	:''(c) We cannot compare z-scores since we do not know the sample sizes
		+
		+	:''(d) ZB is larger
		+	{{hidden\|Answer\|(a)}}
		+
		+	===Problem 13===
		+	Suppose that the mean height of the 35 students in your discussion section was 68.5 inches with a standard deviation of 2.4 inches when a new student, who was 6 feet tall, joined your section. Now calculate the mean for all 36 students.
		+
		+	*Choose one answer.
		+
		+	:''(a) 68.70 inches
		+
		+	:''(b) 74.5 inches
		+
		+	:''(c) 68.60 inches
		+
		+	:''(d) 70.25 inches
		+	{{hidden\|Answer\|(c)}}

@@ Line 169: / Line 169: @@
 :''(d) 25 dogs
 {{hidden|Answer|(a)}}
 <hr>

@@ Line 141: / Line 141: @@
 :''(d) 604
 {{hidden|Answer|(d)}}
 <hr>

← Older revision		Revision as of 05:42, 19 December 2008
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	{{hidden\|Answer\|(d)}}		{{hidden\|Answer\|(d)}}

		+	===Problem 8===
		+	Avoiding an accident while driving can depend upon reaction time. That time, measured from the moment the driver first see the danger until he or she gets a foot on the brake pedal, is thought to follow a Normal Model with mean = 1.50 seconds and standard deviation = 0.18 seconds.
		+	About what percent of the drivers have a reaction time more than 1.25 seconds?

		+	*Choose one answer.
		+
		+	:''(a) None of these values
		+
		+	:''(b) 8.2%
		+
		+	:''(c) 1.39%
		+
		+	:''(d) 91.8%
		+	{{hidden\|Answer\|(d)}}
		+
		+	===Problem 9===
		+	Among first year students at a certain university, scores on the verbal SAT follow the normal curve. The average is around 500 and the SD is about 100. Tatiana took the SAT, and placed at the 85% percentile. What was her verbal SAT score?
		+
		+	*Choose one answer.
		+
		+	:''(a) 90
		+
		+	:''(b) 403
		+
		+	:''(c) 560
		+
		+	:''(d) 604
		+	{{hidden\|Answer\|(d)}}

	<hr>		<hr>

← Older revision		Revision as of 05:35, 19 December 2008
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	:''(d) Less than 280 days		:''(d) Less than 280 days
	{{hidden\|Answer\|(c)}}		{{hidden\|Answer\|(c)}}
		+
		+	===Problem 7===
		+	In standardized scores of achievement motivation that are normally distributed, the mean score is 35 with a standard deviation of 14. Higher scores correspond to more achievement motivation.
		+
		+	Shamu scored in the top 20% of the test takers. What was her score?
		+
		+	*Choose one answer.
		+
		+	:''(a) 20
		+
		+	:''(b) 23
		+
		+	:''(c) 80
		+
		+	:''(d) 47
		+	{{hidden\|Answer\|(d)}}

@@ Line 36: / Line 36: @@
 :''(d) Relative to other classmates, Kefei did better on the exam than Bob.
 {{hidden|Answer|(c)}}
 <hr>