Creating confidence interval for proportion of adults

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Reference no: EM1320413

1) Election poll reported that applicant had n approval rating 31% with margin of error E of 4%. Create a confidence interval for proportion of adults who approved of applicant.

Confidence interval is ......

2) Machine cuts plastic into sheets which are 40 feet (480 inches. Suppose that population of lengths is normally distributed .Complete parts(a) and (b)

a) Company wishes to evaluate mean length machine is cutting the plastic within 0.5 inches. Find out minimum sample size needed to construct a 95% confidence interval for population mean. Suppose the population standard deviation is 1 inch

b) Repeat par(a) using the error tolerance of 0.25 inch

Which error tolerance needs a larger sample size? Describe

a) Tolerance E = 0.25 inch needs a larger sample size. As error size reduces, a large sample should be taken to make sure the desired accuracy.

b) Tolerance E = 0.25 inch needs a larger sample size. As error size rises, a large sample should be taken to make sure the desired accuracy.

c) Tolerance E = 0.5 inch needs a larger sample size. As error size rises, a large sample should be taken to make sure the desired accuracy.

d) Tolerance E = 0.5 inch needs a larger sample size. As error size reduces, a large sample should be taken to make sure the desired accuracy.

Reference no: EM1320413

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