Final Summative ESCODA

What is a proposed explanation, assertion, or assumption about a population parameter or about 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 level which describes the probability of committing an incorrect decision about the null hypothesis?

• A. 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 acceptance region?

• 1.383

• 1.533

• 2.228

• 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

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 would be an appropriate alternative hypothesis for one-tailed test?

• 𝐻𝑎: 𝜇 = 85

• 𝐻𝑎: 𝜇 ≥ 85

• 𝐻𝑎: 𝜇 ≥ 85

• 𝐻𝑎: 𝜇 < 85

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

Which of the following steps is not included in formulating hypothesis?

• Identify the claim to be tested

• Translate the claim into mathematical symbols / notations

• Use the data about sample then compute the test statistic

• Formulate first the null hypothesis and then the alternative hypothesis