Reviewer1 Stat&Prob

In a one-tailed test, in which critical values below will the computed z of 2.312 falls in the non-rejection region?

• 1.383

• 1.533

• 2.228

• 2.354

When is a Type I error committed?

• We reject a null hypothesis that is true.

• We reject a null hypothesis that is false.

• We fail to reject a null hypothesis that is true.

• We fail to reject a null hypothesis that is false.

It is the statistical method used in making decisions using experimental data.

• observation

• analytical testing

• simple analysis

• hypothesis testing

What term is being used to describe a proposed explanation, assertion, or assumption about a population parameter or about the distribution of a random variable?

• statistic

• decision

• hypothesis

• probability

When is a Type II error committed?

• We reject a null hypothesis that is true.

• We reject a null hypothesis that is false.

• We fail to reject a null hypothesis that is true.

• We fail to reject a null hypothesis that is false.

Which of the following must be used as the significance level if we want a lower possibility of correct decision?

• 1%

• 2%

• 5%

• 10%

Which of the following describes a null hypothesis using two-tailed test?

• 𝐻0: 𝜇 = 𝜇0

• 𝐻0: 𝜇 ≠ 𝜇0

• 𝐻0: 𝜇 ≤ 𝜇0

• 𝐻0: 𝜇 ≥ 𝜇0

Which of the following is a Type I error?

• 𝐻0 is true; reject 𝐻0.

• 𝐻0 is false; reject 𝐻0.

• 𝐻0 is true; fail to reject 𝐻0.

• 𝐻0 is false; fail to reject 𝐻0.

Which of the following would be an appropriate null hypothesis?

• The mean of a sample is equal to 80.

• The mean of a population is equal to 80.

• The mean of a population is not equal to 80.

• The mean of a population is greater than 80.

If the computed z-value is 1.286 and the critical value is 1.383, which of the following statements could be true?

• It lies in the rejection region, 𝐻𝑜 must be rejected.

• It lies in the non-rejection region, hence we fail to reject 𝐻𝑜.

• We fail to reject a null hypothesis that is true.

• We fail to reject a null hypothesis that is false.