# Gbs Hdds

Pages: 13 (2474 words) Published: July 24, 2012
1 of 25
Let X represent the amount of time it takes a student to park in the library parking lot at the university. If we know that the distribution of parking times can be modeled using an exponential distribution with a mean of 4 minutes, find the probability that it will take a randomly selected student more than 10 minutes to park in the library lot. | 0.917915|

| 0.670320|
| 0.329680|
| 0.082085|

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Question
2 of 25
On the average, 1.8 customers per minute arrive at any one of the checkout counters of a grocery store. What type of probability distribution can be used to find out the probability that there will be no customer arriving at a checkout counter? | binomial distribution|

| Poisson distribution|
| hypergeometric distribution|
| None of the above.|

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Question
3 of 25
The chancellor of a major university was concerned about alcohol abuse on her campus and wanted to find out the proportion of students at her university who visited campus bars on the weekend before the final exam week. Her assistant took a random sample of 250 students and computed the portion of students in the sample who visited campus bars on the weekend before the final exam. The portion of all students at her university who visited campus bars on the weekend before the final exam week is an example of | a categorical random variable.|

| a discrete random variable.|
| a continuous random variable.|
| a parameter.|

0  out of  6
The correct answer is:
a parameter.

Question
4 of 25
TABLE 13-6
The following EXCEL tables are obtained when "Score received on an exam (measured in percentage points)" (Y) is regressed on "percentage attendance" (X) for 22 students in a Statistics for Business and Economics course. Referring to Table 13-6, which of the following statements is true? | -2.86% of the total variability in score received can be explained by percentage attendance. | | -2.86% of the total variability in percentage attendance can be explained by score received.| | 2% of the total variability in score received can be explained by percentage attendance.| | 2% of the total variability in percentage attendance can be explained by score received. |

0  out of  6
The correct answer is:
2% of the total variability in score received can be explained by percentage attendance.

Question
5 of 25
The employees of a company were surveyed on questions regarding their educational background and marital status. Of the 600 employees, 400 had college degrees, 100 were single, and 60 were single college graduates. The probability that an employee of the company does not have a college degree is: | 0.10.|

| 0.33.|
| 0.67.|
| 0.75.|

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Question
6 of 25
A catalog company that receives the majority of its orders by telephone conducted a study to determine how long customers were willing to wait on hold before ordering a product. The length of time was found to be a random variable best approximated by an exponential distribution with a mean equal to 3 minutes. What proportion of customers having to hold more than 4.5 minutes will hang up before placing an order? | 0.22313|

| 0.48658|
| 0.51342|
| 0.77687|

6  out of  6
Correct!!

Question
7 of 25
Tim was planning for a meeting with his boss to discuss a raise in his annual salary. In preparation, he wanted to use the Consumer Price Index to determine the percentage increase in his real (inflation-adjusted) salary over the last three years. Which of the 4 methods of data collection was involved when he used the Consumer Price Index? | published sources|

| experimentation|
| surveying|
| observation|

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Question
8 of 25
TABLE 13-6
The following EXCEL tables are obtained when "Score received on an exam (measured in percentage points)" (Y) is regressed on "percentage...

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