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Discovering Statistics: Referring to the information from my first question as stated; Nielson Media Research reported that, for the week, ending July 11, 2004, 12 million viewers watched the television show 60 minutes. Suppose that the distribution of viewers of 60 minutes is normal with mean µ = 12 million and the standard deviation σ = 4 million.
a. Find the number of viewers that represents the 75th percentile.
b. On one particular night, 24 million people watched 60 minutes. Is this unusual? On what do you base your answer?
Compare a tabular cum sum chart using standardized values h = 5 and k = 1/2. What is the information you learn.
What is the 95% confidence interval for the standard deviation of birth weights at County General Hospital, if the standard deviation of the last 25 babies born there was 1.1 pounds.
In 1997, 39.4% of men had made orders by phone in the last 12 months a market research analyst feels that this percentage has declined because of internet purchases. she obtains a random sample of 500 men and determines that 191 of them have made ord..
Interpret coefficient on log (salesm). If salesm were to be increased by 20%, what would be estimated change in mktgp? Would this effect be substantive?
If the salaries are normally distributed with a standard deviation of $5,000, find the probability that An individual graduate will have a salary over $45,000.
Calculate the sample correlation coefficient by hand. By use of a spreadsheet calculate the sample correlation coefficient.
The waiting times have a standard deviation of 5.7 minutes. Use a 0.025 significance level to test the claim that with a single line, waiting times vary less than with individual lines.
Explain the difference between a left-tailed, two-tailed, and right-tailed test. When would we choose a two-tailed test? How can we tell the direction of the test by looking at a pair of hypothesis?
The difference between the median and mode
I have been approached by a pharmaceutical company that has developed a new drug, which is supposed to be effective in the treatment of schizophrenia.
When the underlying average of a time series is very stable and there is no trend, cyclical, or seasonal influences,
Positive sales means positive net earnings for any business, sales have no effect on net revenues and insufficient sales can lead to net losses for some businesses.
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