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The mean duration of television commercials on a given network is 75 seconds, with a standard deviation of 20 seconds. Assume that durations are approximately normally distributed.
What is the approximate probability that a commercial will last less than 35 seconds?
Pepsi wanted to test to determine if the males preferred Pepsi more than the females. (a) PConduct the appropriate test and describe the results (ick your own alpha value)
When bucketing data for a histogram what is the standard way of dealing with data entries that are on the boundary of two buckets?
Why do so many of life's events share the same characteristics as the central limit theorem? Why are estimations and confidence intervals important? When might systematic sampling be biased?
Scores are normally distributed with an average of 1500 and a standard deviation of 150 The minimum exam score necessary for applicants to be further considered for admission is?
But each such incident costs $50. What is the probability that maintenance expenses for the press will be no more than $100 on a typical 8 hour workday?
Tthe population standard deviation is not equal to 8 at the 0.05 level of significance. Calculate the value of the test statistic.
Johnny Comlatey has 53% of votes among all voters in two-way race. Probability that newspaper's poll of 380 voters would forecast Johnny Comlatey's opponent the winner is?
A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that:
The results of the simple linear regression are provided below.
What is the probability that the mean weight of sixteen randomly chosen men would exceed the individual weight from part (1)?
The average cost of a renting a compact size car in a major metropolitan area is R51.74 with a standard deviation of 7.48. Assume a normal distribution.
Using a critical value, test hypothesis at the 1% level of significance.
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