Questions from Statistics

Q: Listed below are the measured “specific absorption rates” (SARs

Listed below are the measured “specific absorption rates” (SARs) of radiation (in watts per kilogram, or W/kg) from a sample of cell phones (when held to the head). The data are from the Environmental...

Q: A simple random sample of 16 different cereals is obtained, and

A simple random sample of 16 different cereals is obtained, and the sugar content (in grams of sugar per gram of cereal) is measured for each cereal selected. Those amounts have a mean of 0.295 gram a...

Q: Students randomly selected 30 people and measured the accuracy of their wristwatches

Students randomly selected 30 people and measured the accuracy of their wristwatches, with positive errors representing watches that were ahead of the correct time and negative errors representing wat...

Q: The U.S. Mint has a specification requiring that pennies

The U.S. Mint has a specification requiring that pennies have a mean weight of 2.5 grams (g). Thirty randomly selected pennies have a mean weight of 2.49910 g and a standard deviation of 0.01648 g. Th...

Q: The mean time between failures for a Telektronic Company radio used in

The mean time between failures for a Telektronic Company radio used in light aircraft is 420 hours. After 15 new radios were modified in an attempt to improve reliability, tests were conducted to meas...

Q: When birth weights were recorded for a simple random sample of 16

When birth weights were recorded for a simple random sample of 16 male babies born to mothers taking a special vitamin supplement, the sample had a mean of 3.675 kilograms and a standard deviation of...

Q: If one of the subjects is randomly selected, find the probability

If one of the subjects is randomly selected, find the probability of selecting someone who lied or did not lie.

Q: One of the authors of this text claimed that his pulse rate

One of the authors of this text claimed that his pulse rate was lower than the mean pulse rate of statistics students. The author’s pulse rate was measured and found to be 60 beats per minute, and the...

Q: The National Highway Traffic Safety Administration conducted crash tests of child booster

The National Highway Traffic Safety Administration conducted crash tests of child booster seats for cars. Listed below are results from those tests, with the measurements given in the standard unit “h...

Q: The Carolina Tobacco Company advertised that its best-selling non filtered

The Carolina Tobacco Company advertised that its best-selling non filtered cigarettes contain 40 milligrams of nicotine or less, but Consumer Advocate magazine ran tests on 10 randomly selected cigare...