Exam 3: Descriptive Statistics: Numerical Methods

The following table shows the Price-to-Earnings ratio for a Stereo equipment manufacturing company between 1998 and 2002. Determine the percentage change in the P/E ratios from 1999 to 2000.

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 mean?

A(n)_____ process is able to consistently produce outputs that meet specifications.

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 are the outer fences?

Getting a process into statistical control does not guarantee that the process is capable of _____.

Find the z-score for an IQ test score of 142 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 range?

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 (mean = $3,213): $3,250,$1,127,$2,995,$3,250,$3,445,$3,449,$1,482,$6,120,$3,009,$4,000 What is the variance?

In a statistic class,10 scores were randomly selected with the following results were obtained: 74,73,77,77,71,68,65,77,67,66 What are the outer fences?

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 65^th percentile?

Compute the sample standard deviation of the data set 6,4,2,1,4,1

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 65^th percentile?

The point estimate of the _______________ is the positive square root of the sample variance.

According to Chebyshev's Theorem,at least what proportion of the data will be within for: k = 1.6

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 IQR?

The difference between the largest and smallest measurements in a population or sample is the _____.

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 (mean = 346.6).378,361,350,375,200,391,375,368,321 What is the standard deviation?

It is appropriate to use the Empirical Rule to describe a population that is extremely skewed.

Which percentile describes the third quartile,Q3?

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 65^th percentile?