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 zscore 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:

