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A semiconductor company wants to estimate the fraction of defective computer chips it produces. Suppose that a random sample of 900 chips has 18 defective chips.
a. Find a point estimate of ?.
b. Find a 95% confidence interval for the proportion ? of defective chips
c. Find a one-sided 95% lower confidence interval for the proportion ? of defective chips.
d. How large a sample should be taken in order to be confident with probability 95% that the margin of error to estimate the fraction ? of defective computer chips is 0.025?
Determine standardized test statistic z and its corresponding area. If convenient use technology. z=( ) round to two decimals. Area= ( ).
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If the confidence interval limits do not include age below 20 does it mean that motor cyclists under the age of 20 rarely die in crashes?
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