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# uestion 8 (1 point) Saved It is believed that using a solid state drive (SSD) in...

uestion 8 (1 point)

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It is believed that using a solid state drive (SSD) in a computer results in faster boot times when compared to a computer with a traditional hard disk (HDD). You sample a group of computers and use the sample statistics to calculate a 95% confidence interval of (3.83, 12.85). This interval estimates the difference of (average boot time (HDD) - average boot time (SSD)). What can we conclude from this interval?

Question 8 options:

 1) There is no significant difference between the average boot time for a computer with an SSD drive and one with an HDD drive at 95% confidence.
 2) We are 95% confident that the difference between the two sample means falls within the interval.
 3) We are 95% confident that the average boot time of all computers with an HDD is greater than the average of all computers with an SSD.
 4) We are 95% confident that the average boot time of all computers with an SSD is greater than the average of all computers with an HDD.
 5) We do not have enough information to make a conclusion.

#### Homework Answers

Answer #1

Correct option:

(3) We are 95% confident that the average boot time of all computers with an HDD is greater than the average of all computers with an SDD.

EXPLANATION:
We note that all the values in the confidence interval are positive. The confidence interval estimates the difference of average boot time HDD - average boot time SDD. So, we are 95% confident that the average boot time of all computers with an HDD is greater than the average of all computers with an SDD.

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