Exam 3: Descriptive Statistics: Numerical Methods

In a hearing test,subjects estimate the loudness (in decibels)of sound,and the results are;68,67,70,71,68,75,68,62,80,73,68 What is the 90^th percentile?

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 stop watch 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 third quartile?

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 stop watch 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 mean?

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

According to a survey of the top 10 employers in a major city in the Midwest,a worker spends an average of 413 minutes a day on the job.Suppose the standard deviation is 26.8 minutes and the time spent is approximately a normal distribution. What are the times that approximately 68.26% of all workers will fall?

If specifications are (1.6,1.8),and a 99.73 percent tolerance interval is (1.62,1.83),is the process capable?

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

According to Chebyshev's Theorem,at least what proportion of the data will be within for: k = 3.2

Given a set of data with a mean of 150 and a standard deviation of 20.Using Chebyshev's Theorem,what is the minimum percentage of data between 110 and 190?

Which of the following is influenced the least by the occurrence of extreme values in a sample?

Find the z-score for an IQ test score of 92 when the mean is 100 and the standard deviation is 15.

In a statistic class,10 scores were randomly selected with the following results were obtained (mean = 71.5): 74,73,77,77,71,68,65,77,67,66 What is the variance?

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 stop watch 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 outer fences?

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months.A random sample of the price of 10 computers was taken 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 median?

In a statistic class,10 scores were randomly selected with the following results were obtained (mean = 71.5): 74,73,77,77,71,68,65,77,67,66 What is the standard deviation?

Researchers wish to study fuel consumption rates based on speed.The data from 10 cars is below: It can be shown that for these data: Calculate the sample correlation coefficient.

The average life of Canadian women is 73.75 years and the standard deviation of the women's life expectancy in Canada is 6.5 years. Using the Chebyshev's theorem,determine the minimum percentage of women in Canada whose life expectancy is between 64 and 83.5 years.

According to Chebyshev's Theorem,at least what proportion of the data will be within for: k = 2.5

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months.A random sample of the price of 10 computers was taken 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 mode?

Quality control is an important issue at ACME Company which manufactures light bulbs.In order to conduct testing of 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 third quartile?