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QNT 275 Week 2 Practice: Connect Knowledge Check
Complete the Week 2 Knowledge Check in Connect.
Note: You have unlimited attempts available to complete practice assignments.
1.
In a statistics class, 10 scores were randomly selected with the following results: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66.
What is the IQR?
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11.00
10
5.00
5.25
12.00
2.
A quantity that measures the variation of a population or a sample relative to its mean is called the __.
range
interquartile range
standard deviation
coefficient of variation
variance
3.
An observation separated from the rest of the data is a(n) _.
absolute extreme
outlier
quartile
mode
4.
Quality control is an important issue at ACME Company, which manufactures light bulbs. To test the life-hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted: 378, 361, 350, 375, 200, 391, 375, 368, 321.
What is the mean?
375
389.9
368
346.6
200
5.
In a statistics class, 10 scores were randomly selected with the following results (mean = 71.5): 74, 73, 77, 77, 71, 68, 65, 77, 67, 66.
What is the range?
516.20
144.00
22.72
4.77
12.00
6.
Which percentile describes the first quartile, Q1?
25th
100th
75th
50th
7.
Personnel managers usually want to know where a job applicant ranked in his or her graduating class. With a grade point average of 3.83, Michelle Robinson graduated above the 93rd percentile of her graduating class. What is the percentile rank of a student whose GPA was the median GPA.
75th
50th
25th
93rd
10th
8.
All of the following are measures of central tendency except the __.
mode
range
mean
median
9.
Quality control is an important issue at ACME Company, which manufactures light bulbs. To test the life-hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6).
378, 361, 350, 375, 200, 391, 375, 368, 321
What is the range?
58.5
191
3424.3
10,609
342.43
10.
The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m.). They selected 13 patrons and had them get in line between 2 and 3 p.m. Each was given a stopwatch to record the time they spent in line. The times recorded were as follows (in minutes): 118, 124, 108, 116, 99, 120, 148, 118, 119, 121, 45, 130, 118.
What is the mean?
115.5
148
118
114.15
45
11.
The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m.). They selected 13 patrons and had them get in line between 2 and 3 p.m. Each was given a stopwatch to record the time they spent in line. The times recorded were as follows (in minutes): 118, 124, 108, 116, 99, 120, 148, 118, 119, 121, 45, 130, 118.
What is the median?
118
115.5
45
114.15
148
12.
When establishing the classes for a frequency table, it is generally agreed that the more classes you use the better your frequency table will be.
True
False
