Hi all,

I'd like some advice on some statistics.

I am producing a device in batches of 50.

I require a particular property of the device to be above 1.88 for it to be considered a pass.

I have tested that property on 11 out of a single batch (50) of the device and get a mean of 4.485 with a standard deviation of 0.461.

I would like to determine the minimum number of samples to randomly test from a batch in order to be confident (95% C.I.) that the particular property of the whole batch is above 1.88.

I'm a bit rusty on my stats so any advice would be appreciated.

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