(12
(Choose 1 answer)
(See picture)
A. Z_stat = 0.4517; the new grinding machine should NOT be used.
B. This is a 2-sided test for population proportion.
C. Z_stat = 0.4517; the new grinding machine should be used.
D. Z_stat-1.4336; the new grinding machine should be used.
A manufacturer of interocular lenses will qualify a new grinding machine if there is evidence that the percentage of polished lenses that contain surface defects does not exceed 2%. A random sample of 250 lenses contains 6 defective lenses. Use 5% level of significance.
Choose the CORRECT statement. Given that Z0.05-1.645, Z0.025 1.96
