issagirl05
16.12.2020 •
Mathematics
Can you help me? I don't understand
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Ответ:
is there a specific formula to use for it
Ответ:
a. Mean assembly time is estimated to fall between 15.6mins and 16.8mins with a 92% CI.
b.636 workers
Step-by-step explanation:
Let denote the mean assembly time in minutes.
Standard deviation,
To obtain a 92%CI for based on given parameters:,. is known, therefore we use the interval:
Where, and is obtained from the z-interval tables.
b. A sample of size n needs to be completed based on the info:, E denotes the margin of error.
Therefore the sample size is calculated as:-
Hence, 636 workers should be involved in this study in order to have the mean assembly time required.