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Question 1:
In a city in Italy, 30% of the families have a MasterCard, 20% have an American Express card, and 25% have a Visa card. Eight percent of 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 it has a MasterCard?
Question 2:
A National study has determined that people who work full time average 43.4 hours worked per week.
Assume that the number of hours worked per week for those who work full time is normally distributed. Suppose 12% of these workers work more than 48 hours. Based on this percentage, what is the standard deviation of number of hours worked per week for those workers?
Assume that we know from previous studies that the population mean for minutes of exercise per week for college students is Uu= 100 with a standard deviation =25
Suppose 12% of these workers work more than 48 hours. Based on this percentage, what is the standard deviation of number of hours worked per week for those workers.
Determine the frequencies expected if the two variables, status regarding lab techniques course and laboratory performance, are independent.
The number of lightning strikes in a year at the top of a particular mountain has a Poisson distribution with a mean of 4.2. Find the probability that in a randomly selected year, the number of lightning strikes is 0.
A manufacturer of nickel-hydrogen batteries randomly selects 100 nickel plates for test cells, cycles them a specified number of times, and determines that 14 of the plates have blistered.
Medical Malpractice - An important issue facing Americans is the large number of medical malpractice lawsuits and the expenses that they generate.
In random samples of 12 from each of two normal populations, we found the following statistics: Describe what happens when the sample standard deviations get larger.
Production of the three machines one article is selected at random. if it found that this article is defective, what is the probability that it was manufactured by machine X?
Is there evidence to suggest a difference in the mean waiting times at the four body shops? Use the .05 significance level.
Figures for the yearly crime rate (the number of crimes per 1,000 population) in Mississippi, USA from 1993 to 2002 are as follows:
What is an example of data that can be transformed from one level of measurement to another, and another example of data that cannot be transformed?
Four different types of fertilizers are used on raspberry plants. The number of raspberries on each randomly selected plaint is given below.
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