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Using the most recent itemized phone bills. Assume that incoming and out going calls are equal in the population. This means assume p=0.5. For the number of calls made last month, what would be the mean number of outgoing calls in a random selection of calls? Also, compute the standard deviation. In a selection of 12 calls, what is the probability that less than 3 were outgoing?
To test whether the significant difference between two sample variance using F-tests.
Assuming that the standard deviation is known to be 121.8Ib use 0.05 significance level to test the claim that the population mean of all such bear weights is greater than 150 Ib
The one time fling. Have you ever bought the article of clothing (dress, sports jacket, etc.) worn item once to a party, and then returned purchase?
The probability of contracting the kissing disease is .23 when one is exposed to a certain provocative environment. Sixty people are so exposed. What is the probability that no more than 10 are infected with this dreaded disease.
Compute the value of z and state your decision regarding the null hypothesis.
How many more students should be included in the sample to be 99% sure the sample mean x is within $7 of the population mean u for all students at this college?
Explain why we need to use the t distribution. What assumption do you need to make?
A survey of autos parked in student and staff lots at a large university classified the brands by country of origin, as seen in the table: Given that the car is Europena, what proportion of the drivers are staff?
Past studies have revealed that only 88% of booked passengers actually arrive for flight.) Determine probability that if airline books 17 persons, not adequate seats will be available.
In each of the following scenarios, which would be larger, the mean or median, or would the mean and median be about the same? Provide reasoning--think about the shape of the histogram for the data and how the shape would affect the relationship b..
a) Explain why it would be hard to take a Simple Random Sample? b) Describe how to take a cluster sample of chocolate chip cookies.
Suppose that Total Revenue = 200Q and Total Cost = 80 + 50Q where Q, the quantity sold, is a random variable with expected value 20 and variance 4.
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