Hypothesis

What is the SYMBOL for the NULL HYPOTHESIS?

• H0​

• H1​  

• α

• Ha

Which of the following is NOT a typical phrase of a null hypothesis?

• No change

• No effect

• Does not increase

• A relationship

What is the null hypothesis of this research question, "Does coffee affects sleep?"

• Coffee affects sleep

• Coffee does not affects sleep

• Sleep affects coffee

• Sleep does not affect cofee

What is the alternative hypothesis of this statement, " Does Coke make a UTI worse?

• Coke make a UTI worse.

• Coke does not make a UTI worse.

• UTI is painful.

• UTI is not painful.

Which of the following is the pair of symbols for a two-tailed test?

• = , >

• = , <

• > , <

What is a null hypothesis?

• It always predicts no effect or no relationship between variables.

• It always predicts an effect or relationship between variables.

• It is an educated guess.

• It is a requirement in conducting a research.

Which of the following best describes a Type I error?

• The null is true, but we mistakenly reject it

• The null is false, but we fail to reject it.

• The null is false and we reject it.

• The null is true but we fail to reject it.

Which of the following best describes a Type II error?

• The null is true but we mistakenly reject it.

• The null is false but we mistakenly reject it.

• The null is false but we fail to reject it.

• The null is true but we fail to reject it.

What is the implication if a true hypothesis has been accepted?

• Type I error

• Type II error

• Correct decision

• nothing happens

An environmental scientist wants to test the null hypothesis that an antipollution device for cars is not effective. Under which of the following conditions would a Type 1 error be committed?

• The scientist concludes that the antipollution device is effective when it actually is not.

• The scientist concludes that the antipollution device is not effective when it actually is not.

• The scientist concludes that the antipollution device is not effective when it actually is. 

• A type 1 error cannot be committed in this situation.