Random sample confidence interval

Reference no: EM13105183

A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighted on a very accurate scale. The results in grams were:

a. 3.087

b. 3.131

c. 3.241

d. 3.241

e. 3.270

f. 3.353

g. 3.400

h. 3.411

i. 3.437

j. 3.477

a) Construct a 90 percent confidence interval for the true mean weight.

b) What sample size would be necessary to estimate the true weight with an error of ± 0.03 grams with 90 percent confidence?

c) Discuss the factors which might cause variation in the weight of Tootsie Rolls during manufacture.

Reference no: EM13105183

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