DA simple sample of heights of 6400 English men has a meal of 170cm and a S.D. of 6.4 cm, while a sample of 1600 Americans has a mean of 172 cm and a S.D. of 6.3 cm. Do the data indicate that Americans are, on average, taller than the Englishmen? nking strength of 10 pieces of a metal

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DA simple sample of heights of 6400 English men has a mean
of 170cm and a S.D. of 6.4 cm, while a sample of 1600
Americans has a mean of 172 cm and a S.D. of 6.3 cm. Do the
data indicate that Amnericans are, on average, taller than the
Englishmen?
ii) Tests made on the breaking strength of 10 pieces of a metal
wire gave the results: 578, 572, 570,568,572,570,570,572,596
and 584 kg, test if the mean breaking strength of the wire
can be assumed as 577 kg.
Transcribed Image Text:DA simple sample of heights of 6400 English men has a mean of 170cm and a S.D. of 6.4 cm, while a sample of 1600 Americans has a mean of 172 cm and a S.D. of 6.3 cm. Do the data indicate that Amnericans are, on average, taller than the Englishmen? ii) Tests made on the breaking strength of 10 pieces of a metal wire gave the results: 578, 572, 570,568,572,570,570,572,596 and 584 kg, test if the mean breaking strength of the wire can be assumed as 577 kg.
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