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Exam 3: Descriptive Statistics: Numerical Methods

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Question 71

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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 90^th percentile?

A) 100.8
B) 118
C) 130
D) 112
E) 45

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Question 72

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The geometric mean growth rate of sales for used cars in a geographic area from 2005 to 2009 was 16.42 percent.Annual sales in 2005 were $14.2 million.Find the ending value of sales after this four-year period.

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Question 73

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In a statistics class,10 scores were randomly selected with the following results: 74,73,77,77,71,68,65,77,67,66 What are the lower and upper limits?

Another name for the 50^th percentile is the ___________.

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months.She took a random sample of the price of 10 computers,with the following results. $3,250,$1,127,$2,995,$3,250,$3,445,$3,449,$1,482,$6,120,$3,009,$4,000 What is the 10^th percentile?

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?

According to Chebyshev's Theorem,a range of how many standard deviations would include at least 80 percent of the values?

A correlation coefficient close to -1 says x and y are highly related.

An initial investment of $10,000 has a value of $7,382 at the end of year 1,a rate of return of 62.43 percent for year 2,and a geometric mean return at the end of year 3 of 0.512.Determine the rate of return for the third year.

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?

In a hearing test,subjects estimate the loudness (in decibels) of a sound,and the results are: 68,67,70,71,68,75,68,62,80,73,68. What is the mean?

If the mean,median,and mode for a given population all equal 25,then we know that the shape of the distribution of the population is ____________.

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 first quartile?

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 90^th percentile?

From the following table of values and corresponding sample sizes,calculate the weighted mean.

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 10^th percentile?

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?

Data summarized in a frequency distribution or histogram form are often called weighted data.

Chebyshev's Theorem is only of practical use when analyzing a non-mound-shaped population that is not very skewed.

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 are the lower and upper limits?