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On average, you receive 2 telemarketing calls per day. What is the probability that you will not receive any telemarketing calls today.
There is 0.4 probability that you will not receive a telemarketing phone call in one day. What is the expected number of telemarketing calls you will receive per day? What assumption do you make about the distribution?
The ABC company makes an electric appliance. The life of this appliance has a normal distribution with a mean of 72 months and a standard deviation of 9 months. The ABC company is to determine the warranty period of this appliance. If the appliance breaks down during the warranty period, the company will replace it free of charge. What should the warranty period be if the company does not want to replace more than 3% of the appliance?
Using the data file below, construct a histogram and a frequency polygon. Describe the shape of this distribution.
Using the dataset, produce a graph of per capita GDP for Argentina, China, and Canada from 1965 to 1995. Is inequality between these countries increasing?
Using the z table in Table E of Appendix C, what are the critical values for a two-tailed test when a = 0.03 .
Construct an appropriate control chart and comment on the process.
I have fit a line to data representing cholesterol readings for 28 individuals starting a cholesterol reducing drug. The computer provides the following output, The degrees of freedom for the t test for the slope are
What is the probability that an improperly adjusted machine will produce five or more items before it is stopped? What is the average number of items an improperly adjusted machine will produce before being stopped?
calculate the mean or expected value for the number of retransmissions and calculate the standard deviation for the number of retransmissions.
What sample size would be needed to obtain an error of +/- 10 square millimeters with 99% confidence?
A university found that 20 percent of its students withdraw without completing the introductory statistics course. 20 students registered for a section of the course this term.
Determine the largest plausible average balance for the accounts of those using her managed fund in which you could have 90% confidence.
Find out the mean, median and mode for the given data
Do the data from this sample provide evidence for a significant increase in REM activity during exams? Use a one-tailed test with _ = .01. B.) Compute Cohen's d to estimate the size of the effect.
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