Stat&Prob 4.1

Which of the following refers to an intelligent guess about a population proportion?

• Decision

• Hypothesis           

• Interpretation

• Test statistic

What mathematical model is appropriate for decision-making?

• Graphical representation

• Normal curve

• t-statistic

• z-test     

When the null hypothesis is rejected which of the following is true?

• There is no sufficient evidence to back up the decision.

• There is sufficient evidence to back up the decision.

• The conclusion is not guaranteed.  

• The conclusion is guaranteed.

What is the equivalent for the 95% confidence level?

• 𝛼 = .01

• 𝛼 = .05             

• 𝛼 = .10      

• 𝛼 = .025

Which of the following is the standard deviation of sample proportions?

For a z-test of proportions, which of the following is the rejection region for a two-tailed test?

• 𝑧 < 𝑧𝑎        

• 𝑧 < 𝑧𝑎/2

For a z-test of proportions which of the following is the rejection region for a one-tailed test?

• 
• 
• 
• 

If 𝑝₀ = 0.37, what is 𝑞₀?

• 0.37

• 0.730     

• 0.63

• 0.53

In a z-test of proportions, the computed z lies in the rejection region. What does this mean?

• The sample proportion is equal to the hypothesized proportion.

• The sample proportion is equal to the population proportion.

• The sample proportion is not equal to the hypothesized proportion.

• The sample proportion is not equal to the population proportion.

In a one-tailed z-test proportions the comparative statement is 0.35>0.42. What decision should be made about 𝐻0?

• Reject 𝐻₀             

• Accept 𝐻₀

• The sample proportion >than the population proportion.

• The sample proportion <than the population proportion.