Question
In: Statistics and Probability
show your work please In a study of speed dating conducted at Columbia University, 15 female...
show your work please
In a study of speed dating conducted at Columbia University, 15 female subjects were asked to rate the attractiveness of their male dates, and a sample showed the results to be a mean of 7.35 and standard deviation of 2.70. Construct a 95% confidence interval.
final answer
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Expert Solution
Solution :
Given that,
= 7.35
s =2.71
n = 15
Degrees of freedom = df = n - 1 = 15- 1 = 14
a ) At 95% confidence level the t is ,
= 1 - 95% = 1 - 0.95 = 0.05
/
2= 0.05 / 2 = 0.025
t
/2,df = t0.025,14 = 2.145 ( using student t
table)
Margin of error = E = t/2,df
* (s /
= 2.145* ( 2.70/
= 1.4954
The 95% confidence interval estimate of the population mean is,
- E < 
<
+ E
7.35 - 1.4954 <
<7.35 + 1.4954
5.8546 <
< 8.8454
( lower limit=5.8546 ,upper limit= 8.8454)
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attractive). Construct a confidence interval using a 90%
confidence level. What do the results tell about the mean
attractiveness ratings of the population of all adult females? 5,
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In a study of speed dating, male subjects were asked to rate the attractiveness of their...
In a study of speed dating, male subjects were asked to rate
the attractiveness of their female dates, and a sample of the
results is listed below
(1=not attractive; 10=extremely attractive). Construct a
confidence interval using a 99% confidence level. What do the
results tell about the mean attractiveness ratings of the
population of all adult females?
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What is the confidence interval for the population mean μ?
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(Round to one decimal place as needed.)
In a study of speed dating, male subjects were asked to rate the attractiveness of their...
In a study of speed dating, male subjects were asked to rate
the attractiveness of their female dates, and a sample of the
results is listed below (1 equals =not attractive; 10 equals
=extremely attractive). Construct a confidence interval using a
99% confidence level. What do the results tell about the mean
attractiveness ratings of the population of all adult
females?
6, 8, 2, 9, 7, 6, 7, 7, 9, 10, 5, 9
What is the confidence interval for the...
In a study of speed dating, male subjects were asked to rate the attractiveness of their...
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the attractiveness of their female dates, and a sample of the
results is listed below (1equalsnot attractive; 10equalsextremely
attractive). Construct a confidence interval using a 95%
confidence level. What do the results tell about the mean
attractiveness ratings of the population of all adult females?
7, 8, 1, 8, 6, 5, 6, 7, 7, 10, 3, 8
In a study of speed dating, male subjects were asked to rate the attractiveness of their...
In a study of speed dating, male subjects were asked to rate
the attractiveness of their female dates, and a sample of the
results is listed below (1equalsnot attractive; 10equalsextremely
attractive). Construct a confidence interval using a 90%
confidence level. What do the results tell about the mean
attractiveness ratings of the population of all adult females? 5,
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In a study of speed dating, male subjects were asked to rate
the attractiveness of their female dates, and a sample of the
results is listed below (1equalsnot attractive; 10equalsextremely
attractive). Construct a confidence interval using a 90%
confidence level. What do the results tell about the mean
attractiveness ratings of the population of all adult females? 5,
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In a study of speed dating, male subjects were asked to rate the attractiveness of their...
In a study of speed dating, male subjects were asked to rate
the attractiveness of their female dates, and a sample of the
results is listed below
(1equals=not
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attractive). Construct a confidence interval using a
90%
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attractiveness ratings of the population of all adult females?
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6,
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7,
8,
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