This topic contains a solution. Click here to go to the answer

Author Question: In Mary's first math test she scored 87. The mean and standard deviation for the class were 71 and ... (Read 105 times)

asd123

  • Hero Member
  • *****
  • Posts: 557
In Mary's first math test she scored 87. The mean and standard deviation for the class were 71 and 18 respectively. In her second math test, Mary scored 66. The mean and standard deviation for the class were 53 and 14 respectively.
 
  In which test did Mary do better relative to the rest of the class? Explain your reasoning. (Hint: find the z-scores corresponding to her two test scores.)

Question 2

In a group of 500 men and women, those who smoked did worse on tests of reaction time than those who did not smoke.
 
  A) Designed experiment B) Observational study



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

mariahkathleeen

  • Sr. Member
  • ****
  • Posts: 337
Answer to Question 1

Relative to the rest of the class, Mary did better in the second test. Her z-score on the first test was 0.89 while her z-score on the second test was 0.93.

Answer to Question 2

B




asd123

  • Member
  • Posts: 557
Reply 2 on: Jul 25, 2018
Thanks for the timely response, appreciate it


tuate

  • Member
  • Posts: 332
Reply 3 on: Yesterday
Excellent

 

Did you know?

Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.

Did you know?

Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.

Did you know?

More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

Did you know?

An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

Did you know?

The term pharmacology is derived from the Greek words pharmakon("claim, medicine, poison, or remedy") and logos ("study").

For a complete list of videos, visit our video library