STATISTICS AND PROBABILITY SUMMATIVE TEST 1 (4TH QUARTER)

What hypothesis states that there is a difference between a parameter and a specific value?

• Alternative Hypothesis

• Null Hypothesis

• Left-Tailed Hypothesis

• Right-Tailed Hypothesis

What type of error is occurred in decision making when the true hypothesis is rejected?

• Type I error

• Type IV error

• Type II error

• Type III error

What is the rejection region of a two-tailed test with a 95% level of confidence?

• ± 1.28

• ± 1.65

• ± 1.56

• ± 1.96

A researcher has exam results for students who took a training course for a national exam. The researcher wants to know if trained students score above the national average of 850. Which is the parameter of interest?

• The researcher.

• The national exam.

• The training course.

• The average score of 850.

"A school principal claims that students in her school score an average of 7 out of 10 in exams". What should be the null hypothesis?

• Students in the school score an average of 7 out of 10 in exams.

• Students in the school score more than 7 out of 10 in exams.

• The principal in the school scores an average of 7 out of 10 in exams.

• The principal in the school scored more than 7 out of 10 in exams.

What test is used when the sample size is below 30 and the population standard deviation is unknown?

• chi-square test

• f-test

• t- test

• z-test

What type of statistical test for hypothesis concerning means is used when standard deviation is known?

• chi-square test

• f-test

• t- test

• z-test

What is the value that separates a rejection region from an acceptance region?

• Critical vale

• Parameter

• Hypothesis

• Significance Level

Given the illustration, which of NOT TRUE?

• This is a left-tailed test.

• This is a right-tailed test.

• This has a critical value of 1.645

• This has a level of significance of 0.5.

Given the normal curve, what is the rejection region?

• 𝑧 ≤ 1.645 𝑜𝑟 𝑧 ≥ 1.645

• 𝑧 ≥ −1.645 𝑜𝑟 𝑧 ≥ 1.645

• 𝑧 ≥ −1.96 𝑜𝑟 𝑧 ≤ 1.96

• 𝑧 ≤ −1.96 𝑜𝑟 𝑧 ≥ 1.96