Question

# Based on past data, the proportion of Major League Baseball (MLB) players who bat left handed...

Based on past data, the proportion of Major League Baseball (MLB) players who bat left handed was 0.481. You are interested to see if this is still the case. You conduct a sample of 23 players and find that 10 are left handed hitters. The 95% confidence interval is ( 0.2322 , 0.6374 ). What is the best conclusion of those listed below?

Question 6 options:

 1) The confidence interval does not provide enough information to form a conclusion.
 2) We can conclude that the proportion of MLB players who are left handed hitters is larger than 0.481.
 3) The proportion of MLB players who used to be left handed from 0.481 is 95%.
 4) We can conclude that the proportion of MLB players who are left handed hitters is smaller than 0.481.
 5) We can not claim that the proportion of MLB players who are left handed hitters differs from 0.481.

Question 7 (1 point)

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 99% confidence interval of (3.05, 10.94). This interval estimates the difference of (average boot time (HDD) - average boot time (SSD)). What can we conclude from this interval?

Question 7 options:

 1) We are 99% confident that the average boot time of all computers with an SSD is greater than the average of all computers with an HDD.
 2) We are 99% confident that the average boot time of all computers with an HDD is greater than the average of all computers with an SSD.
 3) We do not have enough information to make a conclusion.
 4) We are 99% confident that the difference between the two sample means falls within the interval.
 5) There is no significant difference between the average boot time for a computer with an SSD drive and one with an HDD drive at 99% confidence.

#### Homework Answers

Answer #1

6)

Based on past data, the proportion of Major League Baseball (MLB) players who bat left handed was 0.481. You are interested to see if this is still the case. You conduct a sample of 23 players and find that 10 are left handed hitters. The 95% confidence interval is ( 0.2322 , 0.6374 ). What is the best conclusion of those listed below?

ANs: 5th option

 We can not claim that the proportion of MLB players who are left handed hitters differs from 0.481.

7)

 We are 99% confident that the average boot time of all computers with an HDD is greater than the average of all computers with an SSD.
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