Statistic Quiz

A left-tailed test with 1% level of significance has a critical value zα=-2.33. If the calculated test statistic value is -2.30, what is the appropriate decision rule?

• Do not reject the alternative hypothesis.

• Reject the null hypothesis.

• Reject the alternative hypothesis.

• Do not reject the null hypothesis.

Which of the following symbols in the alternative hypothesis suggests that the test is two-tailed?

• ≠

• ≤

• ≥

• =

Given that z=1.12, what is the appropriate decision in a right-tailed test given that α=0.05?

• Reject Ho.

• Do not reject Ho.

• Do not reject HA.

• Accept HA.

What is the rejection region in a right-tailed test where α=0.10?

• z>1.28

• z>1.96

• z<1.96

• z<1.645

This refers to the range of values that leads the researcher to reject the null hypothesis and choose the alternative hypothesis.

• rejection region

• domain

• critical range

• acceptance region

Given that the alternative hypothesis is μ≠26, what type of tail test should be used?

• left-tailed test

• right-tailed test

• one-tailed test

• two-tailed test

As n increases, the distribution becomes normal. What is its basis?

• the Central Limit Theorem

• the population variance

• the sample mean

• the population mean

A population has a mean of 27 and a standard deviation of 3, what is the standard deviation of a sampling distribution of sample size of 32?

• .00053

• .0053

• .053

• .53

A high school teacher is interested in evaluating how her students perform in relation to the month of the year in which they were born. In a population of 500 Grade 10 students, the birth months were distributed as follows.

• simple random sampling

• cluster random sampling

• 1-in-k systematic random sampling

• stratified random sampling

Which of the following statements are true?

• Statistics are measurements of samples.

• Statistics are measurements of populations.

• Parameters are measurements of samples.

• Probability are measurements of populations.