Computers and Technology, 17.05.2021 20:50, rahmao2773
Olivia works at a company that creates mobile phones. She wanted to estimate the mean amount of time their new phone's battery lasts with regular use after a full charge. She took a random sample of
6
66 of these phones and randomly assigned each of them to a volunteer. She instructed them to fully charge the phones and use them as they regularly would until the battery died (without recharging the phone). Here are the data they reported:
Phone
1
11
2
22
3
33
4
44
5
55
6
66
Battery life (hours)
8.0
8.08, point, 0
6.0
6.06, point, 0
10.5
10.510, point, 5
9.0
9.09, point, 0
8.5
8.58, point, 5
12
1212
Mean
x
ˉ
=
9
x
ˉ
=9x, with, \bar, on top, equals, 9 hours
Standard deviation
s
x
=
2.07
s
x
=2.07s, start subscript, x, end subscript, equals, 2, point, 07 hours
Assume that all conditions for inference are met.
Which of the following is a
90
%
90%90, percent confidence interval for the mean battery life (in hours)?
Choose 1
Choose 1
(Choice A)
A
9
±
1.4
9±1.49, plus minus, 1, point, 4
(Choice B)
B
9
±
1.7
9±1.79, plus minus, 1, point, 7
(Choice C)
C
9
±
2.0
9±2.09, plus minus, 2, point, 0
(Choice D)
D
9
±
2.07
9±2.079, plus minus, 2, point, 07
Answers: 2
Computers and Technology, 23.06.2019 20:10, banna01man
Leo is a recruitment executive for a large company. he has identified new labor resource requirements in both the marketing and production departments. what should be his first step in recruiting candidates for the positions? a. conduct background checks of candidates b. make job offers c. arrange interviews d. conduct reference checks e. place job ads on job sites
Answers: 1
Computers and Technology, 24.06.2019 17:30, sanchez9211
Click on the tab on the ribbon to open the backstage view. file view insert review
Answers: 1
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