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ycow [4]
1 year ago
12

A company that produces computers recently tested the battery in its latest laptop in six separate trials. The battery lasted 8.

23,7.89,8.14,8.25,8.30, and 7.95 hours before burning out in each of the tests. Assuming the battery duration is normally distributed, construct a 95% confidence interval for the mean battery life in the new model. Multiple Choice [7.9490, 8.3044] [7.9575, 8.2959] [7.9873, 8.2661] [7.9912, 8.2622]
Mathematics
1 answer:
Anna35 [415]1 year ago
8 0

confidence interval for the mean battery life in the new model is [7.9489, 8.3045].

What is confidence interval ?

A confidence interval, in statistics, refers to the chance that a population parameter can fall between a collection of values for an exact proportion of times.

Main body:

Formula for confidence interval is =

CI = x- bar ± z*s/√n            where,

CI = confidence interval

x- bar = sample mean

z = confidence level value

{s} = sample standard deviation

{n} = sample size  

given ;

n = 6

mean = (8.23+7.89+8.14+8.25+8.30+ 7.95)/6

         =  8.127

value of z for 95% C.I. = 1.96

C.I. = 8.127 ± 1.96 * 0.22/√6

C.I. = 8.127 ± 0.1781

C.I. =[7.9490, 8.3044]

Hence correct option is A.

To know more about confidence interval , visit:;

brainly.com/question/15712887

#SPJ4

         

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A bag contains 40 marbles. The probability of selecting a red marble at random is 1/5. How many red marbles are in the bag?
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Step-by-step explanation:

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You always divide by the denominator ( Bottom number of fraction ) first and then you multiply your answer by the numerator ( Top number of fraction ) .

If each group has 1 red marble in it and we have 8 groups, it means that we have 8 red marbles in the bag.

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Easy and quick way if you do not need the explanation:

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