Tuesday, November 25, 2014

322: Sensible or Not? distribution

Distribution Statements: Sensible or Not?
Defend your answer! Here's your claim ... what's your warrant?
  1. Because this data has two modes, it cannot be symmetrical. 
  2. This distribution is left-skewed because it has outliers to the left. 
  3. Josh works at a veterinary clinic and weighs the dogs. He claims there is less variation in the weights of 10 Rottweilers than in the weights of 10 dogs of different breeds. 
  4. Josh combines the weights of 10 toy poodles, 10 Rottweilers and 10 St. Bernards into one big group. He says the distribution has one mode. 
  5. Jean concludes that the mean of her symmetric distribution is greater than the median. 

ch4.2

Monday, November 24, 2014

321: Sensible or Not? central measures

Measures of Central Tendency Statements: Sensible or Not?
Defend your answer! Here's your claim ... what's your warrant?
Give an example or a situation to bolster your position 
  1. A data set should be discarded if the mean exceeds the mode. 
  2. A student with an average of 65 computes her new average after earning a 70 on the last exam. Her new average is 72. 
  3. Observing that the mean weight of a group of patients is 154 pounds and the median weight is 145 pounds, the doctor concludes that there must be an outlier on the heavy side. 
  4. Noting that there are three modes in his data set, Rob assumes there was an error in his data gathering. 
  5. The two means in the data lie at 102 and 201
  6. The two medians in the data set lie at 23 and 28. 
  7. The two modes in the data set lie at 45 and 100. 

ch4.1

Sunday, November 23, 2014

320: Sensible or Not? percent

Percent Statements: Sensible or Not?
Defend your answer! Here's your claim ... what's your warrant?
  1. The percentage of households with more than four children decreased by 100,000 households
  2. Brent makes 120% less than Bill each month 
  3. Ann is 10% taller than Brenda, so Brenda is 10% shorter than Ann
  4. Fifty percent of the people in the room are men and 50% of the people in the room are single. Therefore, 25% of the people in the room are single men.
  5. Pete’s prices are 10% more than Paul’s prices, so Pete’s prices are 110% of Paul’s prices.
  6. The interest rate at the bank increased by 100% 
ch2.3

Saturday, November 22, 2014

319: Sensible or Not? error

Error Statements: Sensible or Not?
Defend your answer! Here's your claim ... what's your warrant?
  1. There are 138,232 species of butterflies and moths on the Earth. 
  2. The measurement taken by an electronic timer must be more accurate than that taken by stopwatch. 
  3. The relative error that a microbiologist makes in measuring a cell must be less than the relative error that an astronomer makes in measuring the width of a galaxy, because cells are smaller than galaxies. 
  4. The bank teller claims that his errors are random even though they are always to his advantage. 
  5. The 6 billionth person on Earth was born on October 12th 1999, in Bosnia 
  6. I would rather be shortchanged by $1 than by 1% 

ch2.2

Friday, November 21, 2014

Thursday, November 20, 2014

317: Church


How many different math concepts can you use this church as an example for?

Wednesday, November 19, 2014