Question
In: Statistics and Probability
5. You took a sample of 5 phones and tested their battery life. You got the...
5. You took a sample of 5 phones and tested their battery life. You got the following battery life (in months) 24, 35, 22, 27, 20. a- You want to test whether the variance in battery life is greater than 30 months squared? b- You conduct a new survey of phones, and among the 7 phones you survey this time, you report the following battery life. 36, 18, 25, 22, 31, 28, 40 You want to test whether the variance in this sample is greater than in your first survey. Use http://www.socr.ucla.edu/applets.dir/f_table.html Note this provides only the right tail, so make sure to build your F-Test accordingly with the largest value on the nominator.
Solutions
null
hypothesis is accepted in both cases.
orchestra answered 1 year agoRelated Solutions
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The life of a 9-volt battery is said to follow a Normal
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(a) Is it believable that mean battery life exceeds 50
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(b) Find the P-value for the test conducted in part a.
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
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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
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thank you.
An important feature of tablets is battery life, the number of hours before the battery needs...
An important feature of tablets is battery life, the number of
hours before the battery needs to be recharged. The data shown in
the table below contain the battery life of 10 WiFi-only and 10
3G/4G/WiFi 9- through 12-inch tablets. Complete parts (a)
through (c).
WiFi-only
3G/4G/WiFi
4444
2525
3030
3535
4242
7070
5050
5454
5050
5555
5050
2121
3535
5959
5555
2525
3535
3232
4141
6666
a. Assuming that the population variances from both types of
tablets are equal,...
An important feature of tablets is battery life, the number of hours before the battery needs...
An important feature of tablets is battery life, the number of
hours before the battery needs to be recharged. The following table
shows the battery life of 12 WiFi-only and 7 3G/4G/WiFi 9-through
12-inch tablets:
WiFi Only
3G/4G+WiFi
12.40
11.70
10.60
11.40
11.50
10.70
12.60
11.50
8.00
11.30
10.90
11.60
11.60
8.90
10.00
10.90
8.90
9.50
10.50
Assuming that the population variances from both types of
tablets are equal, is there evidence of a difference in the means
battery life...
An important feature of tablets is battery life, the number of hours before the battery needs...
An important feature of tablets is battery life, the number of
hours before the battery needs to be recharged. The file Tablets
contains the battery life of 12 WiFi-only and 7 3G/4G/WiFi 9-
through 12-inch tablets. (Data extracted from “Ratings and rec-
ommendations: Tablets,” Consumer Reports, August 2013, p.
24.)
a. Assuming that the population variances from both types
of
tablets are equal, is there evidence of a difference in the
mean
battery life between the two types of tablets?...
An important feature of tablets is battery life, the number of hours before the battery needs...
An important feature of tablets is battery life, the number of
hours before the battery needs to be recharged. The data shown in
the table below contain the battery life of 10 WiFi-only and 10
3G/4G/WiFi 9- through 12-inch tablets.
WiFi-only
3G/4G/WiFi
48
26
35
40
44
65
52
51
60
52
48
23
38
51
56
25
36
31
50
66
a. Assuming that the population variances from both types of
tablets are equal, is there evidence of a...
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A company claims that the mean battery life of their MP3 player
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hours. With previous records, the standard deviation is 1.7 hours.
Using 5% level of significance, is there enough evidence to show
that the true mean battery life is less than the claim?
What is the Null hypothesis (H0); Alternate hypothesis (H1); and...
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5. A large hospital took a simple random sample of 10 babies delivered at the hospital...
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Here are the number of days until weaning for each baby: 210, 217,
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One of the important features of a camera is the battery life as measured by the...
One of the important features of a camera is the battery life as
measured by the number of shots taken until the battery needs to be
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life of 10 subcompact and 10 compact cameras. Complete parts (a)
through (c).
Subcompact
49
50
25
28
31
33
39
57
47
57
Compact
70
30
60
35
55
39
59
46
52
68
. Assuming that the population variances from both...
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