This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Why is instrumentation a potential threat to validity in a time-series design? A) When ... (Read 59 times)

cnetterville

  • Hero Member
  • *****
  • Posts: 547
on: Aug 4, 2018
Why is instrumentation a potential threat to validity in a time-series design?
 
  A) When participants take the same measures over and over again, they tend to get better at them.
  B) When people initiate new approaches or programs, there also may be accompanying changes in the way records are made and kept.
  C) The more times something is measured, the less reliable it is.
  D) When a study is carried out over a long period of time, participants tend to drop out or leave.

Question 2

What is the term used for the potential confounding variable in a time-series study in which the measuring procedures may be inadvertently changed over time?
 
  A) measurement error
  B) history
  C) instrumentation
  D) attrition


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

SVictor

  • Sr. Member
  • ****
  • Posts: 365
Reply #1 on: Aug 4, 2018
Answer to Question 1

Answer: B

Answer to Question 2

Answer: C


cnetterville

  • Hero Member
  • *****
  • Posts: 547
Reply #2 on: Aug 4, 2018
Thank you!


SVictor

  • Sr. Member
  • ****
  • Posts: 365
Reply #3 on: Aug 4, 2018
Always glad to help...


« previous next »
 

Did you know?

Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.

Did you know?

Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

Did you know?

More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

Did you know?

ACTH levels are normally highest in the early morning (between 6 and 8 A.M.) and lowest in the evening (between 6 and 11 P.M.). Therefore, a doctor who suspects abnormal levels looks for low ACTH in the morning and high ACTH in the evening.

Did you know?

There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

Single-dose drug administration: pharmacokinetic values for this drug are as follows: onset of actio Single-dose drug administration: pharmacokinetic values for this drug are as follows: onset of actio
Hokusai, The Great Wave off Kanagawa, from the series Thirty-Six Views of Mount Fuji. Hokusai, The Great Wave off Kanagawa, from the series Thirty-Six Views of Mount Fuji.
Hokusai, Sunshu Ejiri, from the series Thirty-Six Views of Mount Fuji. Hokusai, Sunshu Ejiri, from the series Thirty-Six Views of Mount Fuji.
Rational design of neuraminidase inhibitors Rational design of neuraminidase inhibitors
Drugs with a potential for abuse are categorized into schedules Drugs with a potential for abuse are categorized into schedules
Time spent on, paid work and housework, by living arrangements of Canadian Time spent on, paid work and housework, by living arrangements of Canadian
Video: Alternative Energy Sources

For a complete list of videos, visit our video library