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In a certain city, 30% of the families have a MasterCard, 20% have an American Express card, and 25% have a Visa card. Eight percent of the families have both a MasterCard and an American Express card. Twelve percent have both a Visa card and a MasterCard. Six percent have both an American Express card and a Visa card.
a. What is the probability of selecting a family that has either a Visa card or an American Express card?
b. If a family has a MasterCard, what is the probability that it has a Visa card?
c. If a family has a Visa card, what is the probability that it has a MasterCard?
d. Is possession of a Visa card independent of possession of a MasterCard? Why or why not?
e. Is possession of an American Express card mutually exclusive of possession of a Visa card?
Use exponential smoothing to develop simple, trend (Holt's), and seasonal models (both simple and trend) for forecasting the quarterly revenue from 1-year batteries.
What percent of healthy young adults has osteoporosis by the WHO criterion? Suppose that the standard deviation is the same as for young adults. What percent of this older population has osteoporosis?
Each egg was also measured for volume using a water displacement method. We wanted to know if the two methods agreed or not
For this same sample of n = 45, find out the width of confidence interval around population mean? Illustrate all work.
The mean amount purchased by a typical customer at Churchill's Grocery Store is $23.50 with a standard deviation of $5.00. Assume the distribution of amounts purchased follows the normal distribution. For a sample of 50 customers, answer the follo..
Suppose that the distribution of calories is approximately normal with o = 10. Find the probability that a randomly selected chocolate bar will have a) Between 200 and 220 caloies.
How would you interpret the findings of a correlation study that reported a linear correlation coefficient of +0.3?
Different designs SRS from Normal data, Shape of the population distribution and sample distribution Margin of error doesn"t cover all errors How small a P is convincing?
The following data show the cost of electricity during August 2010 for a random sample of 50 one-bedroom apartments in a large city:
In testing whether each of the independent variables (Xs) in a multiple regression equation is statistically significant in explaining the dependent variable (Y), one uses the:
What is the approximate probability that the mean score X of these students is 23 or higher? D) Which of your two normal probability calculations in (a) and (c) is more accurate? Why?
The number of senior citizens (65 and older) in the US in millions n years after 1990 can be estimated using the formula
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