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[answered] Math 130 ch 9 project-- confidence intervals A 73 105 58 79


Confidence Intervals: Problem attached

1-

Imagine that somehow several tests were put into folders and labeled and then it was

determined that two folders (next to each other pile)were not labeled. Note, the tests were either

Test A or Test B from several classes.

2-

Use box and whisker plots and confidence intervals to determine if these folders are

likely from the same class.

Use 18.13 as your sigma (?).

3-

Check for outliers before you draw your boxplots (use your calculator and see what

it shows). If there is an outlier we remove it for calculations, but still show it.

4-

Based on your two Confidence Intervals- 95% (CI) are these folders likely from the same class?

How did you decide?

5-

Based on the shape of the data (look at a histogram), would the mean be a

good measure to use? What are the means and standard deviations for these samples.

(Don't forget to deal with outliers.)

6-

What does the confidence interval tell us (use student friendly language).



Math 130 ch 9 project-- confidence intervals

 

A

 

73

 

105

 

58

 

79

 

101

 

63

 

70

 

92

 

74

 

50

 

62

 

68

 

94

 

80

 

68

 

68

 

105

 

84

 

101

 

94

 

53

 

89

 

54

 

62

 

84

 

91

 

99

 

62

 

50

 

84

 

103

 

84

 

83

 

92

 

50

 

80

 

99

 

57

 

101

 

74

 

105

 

50

 

55

 

50

 

84

 

75 Names________________________________________________

 

B

 

96

 

78

 

100

 

47

 

78

 

62

 

84

 

72

 

72

 

92

 

94

 

92

 

88

 

97

 

77

 

101

 

28

 

62

 

75

 

83

 

38

 

80

 

60

 

82

 

105

 

96

 

62

 

85

 

96

 

34

 

96

 

78

 

66

 

0

 

76

 

76

 

98

 

82

 

8

 

85

 

54

 

88

 

94 1- Imagine that somehow several tests were put into folders and labeled and then it was

 

determined that two folders (next to each other pile)were not labeled. Note, the tests were either

 

Test A or Test B from several classes. 2- Use box and whisker plots and confidence intervals to determine if these folders are

 

likely from the same class.

 

Use 18.13 as your sigma (?). 3- Check for outliers before you draw your boxplots (use your calculator and see what

 

it shows). If there is an outlier we remove it for calculations, but still show it. 4- Based on your two Confidence Intervals- 95% (CI) are these folders likely from the same class?

 

How did you decide? 5- Based on the shape of the data (look at a histogram), would the mean be a

 

good measure to use? What are the means and standard deviations for these samples.

 

(Don't forget to deal with outliers.) 6- What does the confidence interval tell us (use student friendly language).

 


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