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1. The current values of the stock portfolios for 80 clients of an investment counselor are as listed in data file XR02017. Use your computer statistical software to generate a frequency distribution and histogram describ- ing this information. Do any of the portfolio values seem to be especially large or small compared to the others?
2. One of the ways to evaluate the ease of navigating a corporate website is to measure how long it takes to reach the link where you can view or download the com- pany's most recent annual report. In randomly selecting and visiting 80 corporate websites, an investor needed an average of 39.9 seconds to reach the point where the company's annual report could be viewed or down- loaded. The 80 times are in data file XR02018. Generate a frequency distribution and histogram describing this information. Comment on whether any of the corporate sites seemed to require especially long or short times for the annual report to be found.
Question 1: A study of 20 college students was conducted to see how many adults would have low bone mineral density, even at a younger age. Investigators wish to know what is the probability of having a bone mineral density score less than 2 units..
A certain electronics company produces a particular type of vacuum tube. It has been observed that, on the average, three tubes of 100 are defective. The company packs the tubes in boxes of 400. What is the probability that a certain box of 400 tu..
Observations are taken on sales of a certain mountain bike in 30 sporting goods stores. The regression model was Y = total sales (thousands of dollars). Would the intercept seem to have meaning in this regression?
If we are dealing with non-normal data we use Chebychev's Theorem. While not as precise, it does provide some level of utility. If we use Chebychev
x1 x2 are random samples of size 3 from a normal distribution. use the moment generating function method to prove that
If 700 stolen cars are randomly selected, what is the mean and standard deviation of the number of cars recovered after being stolen?
You took a sample of your expenses for 20 weeks and found that the average is $285 and the standard deviation for the sample is $25. Set up your null and alternative hypothesis for testing whether your cists are different and do the analysis using..
Would you suspect that the IDEA surveys sent to South students each term could be biased in the responses received? Why or why not?
Assuming for a moment that 35% of all Ralph's customers have a discount card, what is the probability of getting a sample proportion at least this big?
in a trial of 250 patients who received 10-mg doses of a drug daily 30 reported headaches as a side effect.a obtain a
We do not know the true mean for this population (in other words, we don't know what proportion of households are satisfied with their banana quality). However, we want to construct a 90% confidence interval for where we believe the true proportio..
a shipment of 20 tv tubes contains 16 good tubes and 4 defective tubes. three tubes are chosen successively and at
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