Which is better, a score of 92 on a test with a mean of 71 and a standard deviation of 15, or a score of 688 on a test with a mean of 493 and a standard deviation of 150? (Assume that the distributions being compared have approximately the same shape
.)
A) A score of 92
B) A score of 688
C) Both scores have the same relative position.
Q. 2A computer network manager wants to test the reliability of some new and expensive fiber-optic Ethernet cables that computer department just received. The computer department received 7 boxes containing 10 cables each.
The manager does not have the time to test every cable in each box. The manager will choose one box at random and test 2 cables chosen randomly within that box. What is the sample?
A) The 7 boxes
B) The one box that was chosen at random from the 7 boxes
C) The 2 cables chosen for testing
D) 70 cables
Q. 3Three board members for a nonprofit organization will be selected from a group of five people. The board members will be selected by drawing names from a hat.
The names of the five possible board members are Allison, Betty, Charlie, Dave, and Emily. The possible outcomes can be represented as follows.
ABC ABD ABE ACD ACE
ADE BCD BCE BDE CDE
Here, for example, ABC represents the outcome that Allison, Betty, and Charlie are selected to be on the board. List the outcomes that comprise the following event.
A = event that Charlie is selected
A) CDE B) ABC, ACD, ACE, BCD, BCE, CDE, BDE
C) ABC, ACD, ACE, BCD, CDE D) ABC, ACD, ACE, BCD, BCE, CDE
Q. 4A variable x has the possible observations shown below.
Possible observations of x: -3 -1 0 1 1 2 4 4 5
Find the z-score corresponding to an observed value of x of 5.
Round the values of and to one decimal place. Round your final answer to two decimal places.
A) -1.44 B) -1.71 C) 1.38 D) 1.44
Q. 5A computer network manager wants to test the reliability of some new and expensive fiber-optic Ethernet cables that the computer department just received. The computer department received 4 boxes containing 40 cables each.
The manager does not have the time to test every cable in each box. The manager will choose one box at random and test 8 cables chosen randomly within that box. What is the population?
A) The 4 boxes
B) The 8 cables chosen randomly for testing
C) 160 cables
D) The one box that was chosen at random from the 4 boxes
Q. 6When a quarter is tossed four times, 16 outcomes are possible.
HHHH HHHT HHTH HHTT
HTHH HTHT HTTH HTTT
THHH THHT THTH THTT
TTHH TTHT TTTH TTTT
Here, for example, HTTH represents the outcome that the first toss is heads, the next two tosses are tails, and the fourth toss is heads. List the outcomes that comprise the following event.
A = event the last toss is heads
A) HHHH, HHTH, HTHH, HTTH, THHH, THTH, TTHH, TTTH, HHHT
B) HHHH, HHTH, HTHH, THHH, TTHH, TTTH
C) HHHH, HHTH, HTHH, HTTH, THHH, THTH, TTHH, TTTH
D) HHTH, HTHH, HTTH, THHH, THTH, TTHH, TTTH
Q. 7In a poll of 50,000 randomly selected college students, 74 answered yes when asked Do you have a television in your dorm room? Identify the sample and population.
A) Sample: the 50,000 selected college students; population: all college students
B) Sample: the 50,000 selected college students; population: the 74 who answered yes
C) Sample: the 74 who answered yes; population: all college students
D) Sample: all college students; population: the 50,000 selected college students
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