Math 156 Sample Exam 3 Formulas Binomial mean np standard ...
Math 156 Sample Exam 3 Formulas Binomial mean np standard ...
Math 156 Sample Exam 3 Formulas Binomial mean np standard ...
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3. Use the normal approximation to estimate the probability that in 800 tosses of a fair coin,<br />
there would be more than 409 heads.<br />
4. Produce a 95% confidence interval for the <strong>mean</strong>, if your sample consists of 200 items, whose<br />
<strong>mean</strong> is 4.31 and the assumed population <strong>standard</strong> deviation is 8.<br />
5. Suppose a 95% confidence interval for the <strong>mean</strong> of a population, computed from a sample of<br />
size 500, is (160, 190).<br />
a) What is the estimated <strong>mean</strong> from the data<br />
b) What is the margin of error<br />
c) Explain in plain language what the interval tells you.<br />
d) Would you expect around 95% of the sampled values to fall in this interval Why or why not<br />
e) What must be true in order for the interval to be valid
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