Unit Test #78

Select your answers to the following 5 questions from the pop-up menus in the right hand column. Clicking the "Begin Test Again" button will clear all the answers.

 

 

Q1:

 

An apple grower finds that 40 out of 200 of his apples are too small for export. Find a 99% confidence interval for the proportion of fruit that is too small in his whole orchard.

A. (0.17, 0.23)

B. (0.16, 0.24)

C. (0.14, 0.28)

D. (0.13, 0.27)

Answer 1:

 

 

Q2:

 

What would be the equivalent z-score for a confidence level of 86%?

A. 1.476

B. 1.47

C. 0.1664

D. 1.664

Answer 2:

 

 

Q3:

 

Find a 86% confidence interval for the proportion of fruit that is too small in the orchard in question 1.

A. (0.17, 0.23)

B. (0.15, 0.25)

C. (0.16, 0.24)

D. (0.13, 0.27)

Answer 3:

 

 

Q4:

 

A random survey carried out by a bank of their customers' bank accounts found that 134 out of 187 had overdrafts. What proportion is this, rounded to 3 significant figures?

A. 0.715

B. 0.716

C. 0.717

D. 0.718

Answer 4:

 

 

Q5:

 

Find a 99% confidence interval for the proportion of overdrawn bank accounts at the bank in question 4.

A. (0.635, 0.805)

B. (0.684, 0.750)

C. (0.685, 0.751)

D. (0.632, 0.801)

Answer 5: