Questions from Statistics Principles

Q: Roberto finishes a triathlon (750-meter swim, 5-

Roberto finishes a triathlon (750-meter swim, 5-kilometer run, and 20-kilometer bicycle) in 63.2 minutes. Among all men in the race, the mean finishing time was 69.4 minutes with a standard deviation...

Q: A highly selective boarding school will only admit students who place at

A highly selective boarding school will only admit students who place at least 1.5 standard deviations above the mean on a standardized test that has a mean of 200 and a standard deviation of 26. What...

Q: A manufacturer of bolts has a quality- control policy that requires

A manufacturer of bolts has a quality- control policy that requires it to destroy any bolts that are more than 2 standard deviations from the mean. The quality-control engineer knows that the bolts co...

Q: Explain the meaning of the following percentiles. Source: Advance

Explain the meaning of the following percentiles. Source: Advance Data from Vital and Health Statistics. (a) The 15th percentile of the head circumference of males 3 to 5 months of age is 41.0 cm. (b)...

Q: The data set “Tornadoes_2017” located at www.

The data set “Tornadoes_2017” located at www.pearsonhighered.com/ sullivanstats contains a variety of variables that were measured for all tornadoes in the United States in 2017. For each of the follo...

Q: Explain the meaning of the following percentiles. Source: National

Explain the meaning of the following percentiles. Source: National Center for Health Statistics. (a) The 5th percentile of the weight of males 36 months of age is 12.0 kg. (b) The 95th percentile of t...

Q: Violent crimes include rape, robbery, assault, and homicide.

Violent crimes include rape, robbery, assault, and homicide. The following is a summary of the violent-crime rate (violent crimes per 100,000 population) for all 50 states in the United States plus Wa...

Q: One variable that is measured by online homework systems is the amount

One variable that is measured by online homework systems is the amount of time a student spends on homework for each section of the text. The following is a summary of the number of minutes a student...

Q: The following graph is an ogive of IQ scores. The vertical

The following graph is an ogive of IQ scores. The vertical axis in an ogive is the cumulative relative frequency and can also be interpreted as a percentile. (a) Find and interpret the percentile rank...

Q: The following graph is an ogive of the mathematics scores on the

The following graph is an ogive of the mathematics scores on the SAT. The vertical axis in an ogive is the cumulative relative frequency and can also be interpreted as a percentile. (a) Find and inter...