Question
In: Statistics and Probability
The following data represent the battery life, in hours, for a random sample of ten full...
The following data represent the battery life, in hours, for a random sample of ten full charges on ipod music player.
7.3 10.2 12.9 10.8 12.1 6.6 10.2 9.0 8.5 7.1
a) construct a 90% confidence interval for the mean number of hours the battery will last on this player.
b) Suppose you wanted more accuracy. What can be done to increase the accuracy of the interval without changing the level of confidence?
thank you.
Solutions
orchestra answered 2 years agoRelated Solutions
The following summary statistics represent the hours of battery life for 4 brands of laptops. At...
The following summary statistics represent the hours of battery
life for 4 brands of laptops. At the 0.05 significance level, do
the data provide sufficient evidence to conclude that a difference
exists between the the battery life of the fourdifferent
brands?
Column n Mean Std. Dev. Brand_A 8 7.69 1.62 Brand_B 8 10.44 2.45
Brand_C 10 8.55 2.52 Brand_D 8 5.91 1.30
The following data represent the level of happiness and level of health for a random sample...
The following data represent the level of happiness and level of
health for a random sample of individuals from the General Social
Survey. A researcher wants to determine if health and happiness
level are related. Use the αα = 0.05 level of significance to test
the claim.
Health
Excellent
Good
Fair
Poor
Very Happy
271
261
82
20
Pretty Happy
247
567
231
53
Not Too Happy
33
103
92
36
*Source: General Social Survey
1) Determine the null and...
A random sample of ten professional athletes produced the following data. The first row is the...
A random sample of ten professional athletes produced the
following data. The first row is the number of endorsements the
athlete has and the second row is the amount of money made (in
millions of dollars) by the athlete.
what is the y-intercept of ^ and what does it represent?
what is the linear coefficient?
Number of Endorsements
0
3
2
1
5
5
4
3
0
4
Profit (in
Millions)
2
8
7
3
13
12
9
9...
A random sample of ten professional athletes produced the following data. The first row is the...
A random sample of ten professional athletes produced the
following data. The first row is the number of endorsements the
athlete has and the second row is the amount of money made (in
millions of dollars) by the athlete. If a professional
athlete did 6 endorsements, what could they expect to profit
according to the regression equation? Round to one decimal
point.
Number of Endorsements
0
3
2
1
5
5
4
3
0
4
Profit (in
Millions)
2...
The following data represent the pH of rain for a random sample of 12 rain dates....
The following data represent the pH of rain for a random sample
of 12 rain dates. A normal probability plot suggests the data could
come from a population that is normally distributed. A boxplot
indicates there are no outliers. Complete parts (a) through (d)
below. 5.30 5.72 4.99 4.80 5.02 4.57 4.74 5.19 5.29 4.76 4.56 4.91
(a) Determine a point estimate for the population mean. A point
estimate for the population mean is nothing. (Round to two decimal
places...
The following data represent the pH of rain for a random sample of 12 rain dates....
The following data represent the pH of rain for a random sample
of 12 rain dates. A normal probability plot suggests the data could
come from a population that is normally distributed. A boxplot
indicates there are no outliers. Complete parts a) through d)
below. 5.05 5.72 5.24 4.80 5.02 4.59 4.74 5.19 5.29 4.76 4.56 5.70
LOADING... Click the icon to view the table of critical
t-values.
c) Construct and interpret a 99%
confidence interval for the mean pH...
The following data represent the pH of rain for a random sample of 12 rain dates....
The following data represent the pH of rain for a random sample
of 12 rain dates.
A normal probability plot suggests the data could come from a
population that is normally distributed. A boxplot indicates there
are no outliers. Complete parts (a) through (d) below 5.58 5.58
5.72 5.24 5.24 4.80 5.02 5.03 5.03 4.74 5.19 4.87 4.87 4.76 4.56
4.91 4.91
(a) Determine a point estimate for the population mean. A point
estimate for the population mean is nothing....
The following data represent the dividend yields? (in percent) of a random sample of 28 publicly...
The
following data represent the dividend yields? (in percent) of a
random sample of 28 publicly traded stocks.
2.55
0.47
1.59
0.44
0.07
2.53
0.14
2.04
0.47
2.98
0
2.88
3.2
0.31
0.57
3.43
2.35
0.97
1.31
2.94
0
0.37
0
1.93
0
1.61
0.44
0.23
Compute the? five-number summary
The following data represent the pH of rain for a random sample of 12 rain dates....
The following data represent the pH of rain for a random sample
of 12 rain dates. A normal probability plot suggests the data could
come from a population that is normally distributed. A boxplot
indicates there are no outliers. Complete parts a) through d)
below.
5.58 5.72 4.89 4.80 5.02 4.58 4.74 5.19 4.61 4.76 4.56 5.69
The following data represent the pH of rain for a random sample of 12 rain dates....
The following data represent the pH of rain for a random sample
of 12 rain dates. A normal probability plot suggests the data could
come from a population that is normally distributed. A boxplot
indicates there are no outliers. Complete parts (a) through (d)
below.
Open in StatCrunch
+
Copy to Clipboard
+
Open in Excel
+
5.585.58
5.72
4.624.62
4.80
5.02
4.684.68
4.74
5.19
5.345.34
4.76
4.56
5.305.30
(a) Determine a point estimate for the population mean.
A point...
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