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One kind of plant has only blue flowers and white flowers. According to a genetic model, the off-springs of a certain cross have a 75 percent chance to be blue-flowering, and a 25 percent chance to be white-flowering, independently of one another. Two hundred seeds of such a cross are raised, and 142 turn out to be blue-flowering. Are the data consistent with the model?
Revenue, The marketing research department for a company that manufactures and sells "notebook" computers established the following price-demand and revenue functions.
What are the mean, variance and standard deviation of the data? provided? What is the probability of occurrence (percentage) of ± 2 standard deviations?
A large population of overdue bills has balances that follow a normal curve. When we take a sample of 100 of these the average is $500 and the SD is $100.
The samples do indicate that university A's students are younger than university B's; but is the difference significant at the 1% level?
What do confidence intervals represent? What is the most controllable method of increasing the precision of or narrowing the confidence interval?
N=120, population standard deviation is (known) 5, alpha =.05, standard error of the mean (sigma of xbar)= .46, h0 is rejected if xbar
If the manufacturer wants to keep the mean at 12.8 ounces but adjust the standard deviation so that only 2% of the bags weigh less than 12 ounces, how small must that standard deviation be?
The amount of time a bank teller spends with each customer is normally distributed with a mean of 3.10 minutes and a standard deviation of 0.40 minutes.
Find a 95% confidence interval for the mean amount spent by patients at the pharmacy. Show your calculations and/or explain the process used to obtain the interval.
Indicate at which point flat-of-the-curve medicine is experienced in the following example (imagine that antibiotics have been prescribed for a given population of 1,000 elderly persons).
A study of the time spent shopping in a supermar- ket for a market basket of 20 specific items showed an approximately uniform distribution between 20 minutes and 40 minutes. What is the probability that the shopping time will be:
Although Bob raised the price to $1.75, sales of quarter-pound burgers rose to 8,200. Explain why this does not represent a violation of the law of demand.
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