Introduction to the Practice of Statistics 9th edition by David S. Moore Test bank

 A) 

 B) 

 C) 

 D)They all have about the same median.
 
 
169.Twenty professional athletes were asked, “What age did you graduate from college?” The responses are displayed in the histogram below.
 

 
What is the best measure of the central tendency for these data?
 A)Mean
 B)Median
 C)Standard deviation
 D)Degrees of freedom
 
 
170.Twenty professional athletes were asked, “What age did you graduate from college?” The responses are displayed in the histogram below.
 

 
Which of the statistics below appear to be the largest based on these data?
 A)Min
 B)Mean
 C)Median
 D)Range
 
 
171.Twenty professional athletes were asked, “What age did you graduate from college?” The responses are displayed in the histogram below.
 

 
Which of the statistics below appear to be the smallest based on these data?
 A)Max
 B)Mean
 C)Median
 D)Range
 
 
172.Twenty professional athletes were asked, “What age did you graduate from college?” The responses are displayed in the histogram below.
 

 
Do there appear to be any outliers in the data set?
 A)Yes
 B)No
 C)Can't tell
 
 
173.Twenty professional athletes were asked, “What age did you graduate from college?” The responses are displayed in the histogram below.
 

 
Does the distribution appear to be symmetric?
 A)Yes
 B)No
 C)Can't tell
 
 
174.Twenty professional athletes were asked, “What age did you graduate from college?” The responses are displayed in the histogram below.
 

 
The maximum value is
 A)50.
 B)55.
 C)60.
 D)Can't tell.
 
 
175.Which density curve below has the largest standard deviation?
 A) 

 B) 

 C) 

 D) 

 
 
176.Which density curve below has the smallest standard deviation?
 A) 

 B) 

 C) 

 D) 

 
 
177.The density curve below is __________.

 A)right-skewed
 B)left-skewed
 C)symmetric
 D)None of the above
 
 
178.Which of the following does not adequately reveal outliers?
 A)Density curves
 B)Stemplots
 C)Histograms
 D)Modified boxplots
 
 
179.The number of Facebook friends students at a university have are Normally distributed with a mean of 1200 and a standard deviation of 200. What percentage of students has at least 1000 Facebook friends?
 A)84.13%
 B)15.86%
 C)42.07%
 D)None of the above
 
 
180.The number of Facebook friends students at a university have are Normally distributed with a mean of 1200 and a standard deviation of 200.  What percentage of students has exactly 1000 Facebook friends?
 A)84.13%
 B)15.86%
 C)42.07%
 D)None of the above
 
 
181.Determine whether each of the following statements regarding the density curve below is true or false.
 

 
A)It is symmetric.
B)The total area under the curve is 1.
C)The median is 1.
D)The mean is 1.
 
 
182.For the density curve below, what percentage of the observations lies above 1.5?
 

 A)25%
 B)50%
 C)75%
 D)80%
 
 
183.For the density curve below, what percentage of the observations lies between 0.5 and 1.2?
 

 A)25%
 B)35%
 C)50%
 D)70%
 
 
184.For the density curve below, which one of the following is TRUE?
 

 A)The mean and median are equal.
 B)The mean is greater than the median.
 C)The mean is less than the median.
 D)The mean could be either greater than or less than the median.
 
 
185.Which one of the following statements about a density curve is FALSE?
 A)A density curve always has an area beneath it equal to 1.
 B)A density curve can adequately describe outliers observed in data.
 C)A density curve is always on or above the horizontal axis.
 D)A density curve comes in many shapes, some of which are symmetric while others are skewed.