PRE-FINAL G11 STATISTICS AND PROBABILITY

The value set for α is also known as ________________.

• Level of Association

• Level of Confidence

• Level of Relation

• Level of Significance

It is a conjecture or supposition about population parameter.

• Left-tailed Test

• Right-tailed Test         

• Statistical hypothesis

• Testing hypothesis

A type I error occurs when we _____.

• reject the Ho when it is true

• failed to reject the Ho when it is false

• failed to reject the Ho when it is true

• reject the Ho when it is false

A type II error occurs when we _____.

• reject the Ho when it is true

• failed to reject the Ho when it is false

• failed to reject the Ho when it is true

• reject the Ho when it is false

Which of the following is the level of significance?

• β error

• probability of type I error

• probability of type II error

• validity error

Increasing the sample size will reduce the probability of committing a Type I and Type II error.

• Always true

• Sometimes true

• Never true

• Cannot be determined

The statement “the average number of working hours is not equal to 10 hours per week” is an example of _________.

• Alternative Hypothesis

• Null Hypothesis

• Type I error

• Type II error

A manufacturer of detergent powder concludes that more than 25% of the customers prefer brand Y when in fact it is equal to 25%. This situation is an example of ____________.

• Alternative Hypothesis

• Null Hypothesis

• Type I error

• Type II error

It is a/an ________ test if the alternative hypothesis is directional.

• one-tailed

• two-tailed

• three-tailed

• no-tailed

We use the ____ to find the critical values associated with sample greater than or equal to 30 and the population standard deviation is known.

•  z -test

• H - test

• t - test

• U - test