Question

Use the following to answer questions 20-25: A company makes plastic cups. Four samples of 15 cups were taken from an ongoing process to establish ap chart for control The samples and the number of defectives in each are shown in the following table: Sample Number of Defectives 1 15 2 2 15 3 15 3 4 15 5 What is the proportion defective for Sample 12 O 0122 O 0.667 O 0.167 O 0223 O 0.200 Question 21 1 pts What is the average proportion defective? O 0.167 O 0.667 O 0.123 O 0.223 O 0.200 Question 22 1 pts What is the standard deviation of the sampling distribution of sample proportion defective? Please carry FOUR decimal places for the calculation o 0.0093 O 0.1865 O 0.0667 O 0.005 O 0.0963 Question 23 1 pts What is the z-value associated with a 3% alpha risk? O 3.00 o 217 258 234 196

Answer 1

Answer to first question :

Proportion of defective in sample 1 = 2/15 = 0.133

Answer to 2^nd question :

Total number of defective = 2 + 3 + 5 = 10

Total number in 4 samples = 4 x 15 = 60

Average proportion defective = 10/60 = 0.167