Statistics and probability mock exam

Which of the following is a proposed explanation, assertion, or assumption about a population parameter or the distribution of a random variable?

• Decision

• Probability

• Statistics

• Hypothesis

What is the statistical method used in making decisions using experimental data?

• Simple analysis

• Hypothesis testing

• Analytical testing

• Experimental testing

What term is also the probability of committing an incorrect decision about the null hypothesis?

• Level of error

• Level of acceptance

• Level of hypothesis

• Level of significance

Which of the following describes an alternative hypothesis using two-tailed test?

• 𝐻𝑎 = 100

• 𝐻𝑎 > 100

• 𝐻𝑎 ≠ 100

• 𝐻𝑎 < 100

In a one-tailed test, in which critical value listed below will the computed z of 2.313 fall in the rejection region?

• 1.383

• 2.228

• 1.533

• 2.365

Which of the following would be an appropriate null hypothesis?

• The mean of a sample is equal to 75

• The mean of a population is equal to 75

• The mean of a sample is not equal to 75.

• The mean of a population is greater than 75.

When is a Type I error committed?

• We reject a null hypothesis that is false.

• We reject a null hypothesis that is true.

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

• We fail to reject a null hypothesis that is false

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 is a Type I error?

• Ho is true; reject Ho.

• Ho is true; fail to reject Ho

• Ho is false; reject Ho

• Ho is false; fail to reject Ho

Which of the following describes an alternative hypothesis in a left-tailed test?

• 𝐻𝑎 > 100

• 𝐻𝑎 < 100

• 𝐻𝑎 = 100

• 𝐻𝑎 ≠ 100