Having trouble decidng which hypothesis procedure should be used One they test a

Question

Having trouble decidng which hypothesis procedure should be used

One they test a new machine that akes ball bearing to compare it to the old one. The bearings have ti withstand 400lbs per sq inch. They produce 100 and find they average strength is 398.5 with a DS of 5lbs per sq in. X=0.05.

Another is a claim that 90% of items produced are nondefective. They feel it will raise the proportion of nodefective above the current 90%, but costs aconsiderable amount. The sample is 121items,and 7 are defective. X=.05    I believe this is a on sample z for porportion

These all have anwers like one sample z test pop mean, two sample z test pop mean, 1 sample z proportions, 2 sample prop., one sampl t test , and none of the above

Explanation / Answer

since we only have one average in the sample size and a standard deviation

we can use a sample Z test population mean for one sample but only for mean

because you have a average so it is a Z test for average

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