A company manufactures 2,000 units of its flagship product in a day. The quality control department takes a random sample of 40 units to test for quality. The product is put through a wear-and-tear test to determine the number of days it could last. If the product has a lifespan of less than 26 days, it is considered defective. The table gives the sample data that a quality control manager collected.

39 31 38 40 29
32 33 39 35 32
32 27 30 31 27
30 29 34 36 25
30 32 38 35 40
29 32 31 26 26
32 26 30 40 32
39 37 25 29 34

Question

A company manufactures 2,000 units of its flagship product in a day. The quality control department takes a random sample of 40 units to test for quality. The product is put through a wear-and-tear test to determine the number of days it could last. If the product has a lifespan of less than 26 days, it is considered defective. The table gives the sample data that a quality control manager collected. 

39	31	38	40	29
32	33	39	35	32
32	27	30	31	27
30	29	34	36	25
30	32	38	35	40
29	32	31	26	26
32	26	30	40	32
39	37	25	29	34

xenesis98 · Answer

Which sample size would you use to get the best point estimate?
a.90
b.70
c.150
d.500
e.280

latinc · Answer

just guess, but I would  consider that the larger the sample the better the accuracy

xenesis98 · Answer

what no

kropot72 · Answer

There is a missing detail from the question. It is necessary to know the required 'percentage confidence interval' for the population proportion to enable the sample size to be calculated.