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The results from a statistics class' first exam are as follows: The average grade obtained on the exam by its 45 students is an 85, with a standard deviation of 15 points. Answer the following based on this information:
What grade is required in order to be in the top 20 percent?
If a company employs n salespersons, its gross sales in thousands of dollars may be regarded as a random variable having a gamma distribution with α = 80√n and β = 2.
The value of the standardized test statistic
Which type of interval should you use to learn about the mean spending habits of your typical customer?
Assuming that the risk-free rate is 4.2% and the market risk premium is 6.2%, calculate Michalko's weighted-average cost of capital.
A telemarketing executive has determined, by surveying, that, for a particular product, 17% of the people contacted will purchase the product.
Sony's new optical disk system prototype tested and claimed to be able to record an average of 1.2 hours of high-definition TV.- Assume n = 10 trials and σ = 0.2 hour. Give a 90% confidence interval.
Explain why a process can be out of control even though all the samples fall within the upper and lower control limits.
If a total of more than 4 cars are in line (including the car at the window) a car will not enter the line. It takes an average of 4 minutes(exponentially distributed) to serve a car. What is the average number of cars waiting for the drive-in win..
Using your own words, what is statistical variability? Why is it important for researchers to understand the variability in their data?
What's the probability that the attorney will be selected for the next case, assuming all registered attorneys are eligible? What is the probability that her partner will be selected in this scenario? What is the probability that the attorney OR her ..
We randomly assigned blocks of 7 consecutive nights to the intervention or the control strategy. The primary outcome was patients' length of stay in the ICU.
to decide whether two different types of tennis raquet have the same true average power different raquets have been
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