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. 
