A sample survey of 54 discount brokers showed that the mean price charged for a trade of
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Question:
A sample survey of 54 discount brokers showed that the mean price charged for a trade of 100 shares at $50 per share was $33.77 and a sample standard deviation of $15.
a)Develop a 95% confidence interval for the mean price charged by discount brokers for a trade of 100 shares at $50 per share.
b)Explain, in context, what the interval you found tells you.
c)What sample size would be necessary to achieve a margin of error of $2? Assume a confidence level of 95%.
d)Three years ago the mean price charged for a trade of 100 shares at $50 per share was $39.25. Has the price dropped significantly? Justify.
Related Book For
Essentials of Statistics for Business and Economics
ISBN: 978-1305081598
7th edition
Authors: David Anderson, Thomas Williams, Dennis Sweeney, Jeffrey Cam
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