Q4M5

What is the critical value of z for a right-tailed test with α=0.01?

• 1.645

• 2.33

• 1.96

• 2.576

In hypothesis testing, what is the term for the value that separates the rejection region from the acceptance region?

• Parameter

• Critical value

• Significance level

• Hypothesis

For a two-tailed test with n=19 and α=0.05, what is the critical value?

• ±2.092

• ±2.878

• ±2.145

• ±2.101

In a two-tailed test with a sample size of 40, the null hypothesis will be rejected at 5% level of significance if the test statistic is:

• z≤−2.33 or z≥3.33

• z≤−1.96 or z≥1.96

• z≤−1.645 or z≥1.645

• z≤−1.28 or z≥1.28

If the alpha level is increased from 0.01 to 0.05, what happens to the boundaries for the critical region?

• They move closer to the center

• They remain the same

• They move farther away from the center

• They become undefined

In a right-tailed test, the rejection region lies in which part of the normal distribution?

• Left tail

• Center

• Right tail

• Both tails

What is the rejection region for a left-tailed test with α=0.01?

• z≤−1.645

• z≥1.645

• z≥−2.576

• z≤−2.576

What is the critical value if the population variance is unknown, n=13, α=0.05, and it is a one-tailed test?

• t=1.782

• t=2.179

• t=2.681

• t=3.055

For a two-tailed test with population variance known and α=0.10, what is the critical region?

• z≤−2.33 or z≥2.33

• z≤−1.645 or z≥1.645

• z≤−1.96 or z≥1.96

• z≥1.28

In hypothesis testing, what does a critical value represent?

• The point on the test distribution

• The mean of the sample

• The standard deviation

• The sample size