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Assignment
 
NOTE TO ALL STUDENTS:

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Please print out OR save as htm file on your computer hard drive, as soon as you access it online. Use this copy to prepare your answers. This is because you will NOT be able to save your answers online, and then come back to finalise your assignment at a later date. 
When you have formulated all your answers, then go online again, and insert your answers to each question. 
Only then should you choose the SUBMIT button.
Submission to this assessment will be open one week prior to the due date of 16 May 2011. If you wish to submit prior to this, (that is BEFORE 9 May 2011), you are advised to contact the Course Leader for permission to do so. 
ONLY choose the SUBMIT button when you have fully answered ALL the questions in this assignment. Submission to this assessment will be open one week prior to the due date of 16 May 2011. If you wish to submit prior to this, (that is BEFORE 9 May 2011), you are advised to contact the Course Leader for permission to do so.
REMEMBER: You can ONLY submit this assessment ONCE.
QUESTION 1
True or False: A continuous variable may take on any value within its  http://ukthesiss.com/ibm relevant range even though the measurement device may not be precise enough to record it.
 
True
 
False
QUESTION 2
TABLE 2-5 
The following are the durations in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier. 
Time (in minutes) Relative
Frequency
0 but less than 5 0.37
5 but less than 10 0.22
10 but less than 15 0.15
15 but less than 20 0.10
20 but less than 25 0.07
25 but less than 30 0.07
30 or more 0.02
 
 
Referring to Table 2-5, if 100 calls were sampled, __________ of them would have lasted less than 5 minutes or at least 30 minutes or more.
 
35
 
37
 
39
 
None of the above.
QUESTION 3
According to the empirical rule, if the data form a ‘bell-shaped’ normal distribution, __________ percent of the observations will be contained within 2 standard deviations around the arithmetic mean.
 
68.26
 
88.89
 
93.75
 
95.44
QUESTION 4
True or False: As a general rule, an observation is considered an extreme value if its Z score is greater than –3.
 
True
 
False
QUESTION 5
If we know that the length of time it takes a college student to find a parking spot in the library parking lot follows a normal distribution with a mean of 3.5 minutes and a standard deviation of 1 minute, find the probability that a randomly selected college student will find a parking spot in the library parking lot in less than 3 minutes.
 
0.3551
 
0.3085
 
0.2674
 
0.1915
QUESTION 6
True or False: The probability that a standard normal random variable, Z, is between 1.00 and 3.00 is 0.1574.
 
True
 
False
QUESTION 7

问题7:雇主的鱼市场有一个助理已确定权重的鲶鱼通常分布,均值为3.2磅和0.8磅的标准偏差。有多少百分比的4鱼样本的样本均值在3.0和4.0之间磅?
The owner of a fish market has an assistant who has determined that the weights of catfish are normally distributed, with mean of 3.2 pounds and standard deviation of 0.8 pound. What percentage of samples of 4 fish will have sample means between 3.0 and 4.0 pounds?
 
84%
 
67%
 
29%
 
16%
QUESTION 8
True or False: As the sample size increases, the effect of an extreme value on the sample mean becomes smaller.
 
True
 
False
QUESTION 9
A university dean is interested in determining the proportion of students who receive some sort of financial aid. Rather than examine the records for all students, the dean randomly selects 200 students and finds that 118 of them are receiving financial aid. The 95% confidence interval for the population proportion is 0.59 ± 0.07. Interpret this interval.


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