math
posted by Anonymous .
I was given a table that showed a simple random sample of adults' age and annual income living in suburb of a large city.
a) What is the probability that a person chosen at random from those in this sample will be the 3145 age category? The answer I got is .43 or 43%.
b) What is the probability that a person chosen at random from those in this sample whose incomes are over $50,000 will be in the 3145 age category? I found this to be .365, or 36.5%.
c) Bsed on your answers in parts a and b, is annual income independeent of age category for those in this sample? Explain. How do I prove this? I don't know what to do for this part.

It is not possible to critique answers a or b because the table is not here.
On c, again we need the table. 
Here is the table:
Annual income
Age 25K35K 35,00150K Over 50K
2130 8 15 27
3145 22 32 35
4660 12 14 27
Over 60 5 3 7
Respond to this Question
Similar Questions

mathmath
A study conducted by the Metro Housing Agency in a midwestern city revealed the information below concerning the age distribution of renters in the city. (Round your answers to four decimal places.) Age Adult Population, % Group Who … 
statistics
A nationwide study indicated that 27% of adults said that chocolate was their favorite ice cream flavor. A simple random sample of 150 adults is obtained. A.) Describe the sampling distribtuion of p, the sample proportion of adults … 
statistics
A random sample of 80 youths and a second random sample of 120 adults showed that 18 of the youths and 10 of the adults had been ticketed for careless driving. Use a 1% level of significance to test the claim that youth have a higher … 
statistics
Assume that we collect a large (n>30) simple random sample of annual incomes of adults in the United States. Because the sample is large, can we approximate the distribution of those incomes with a normal distribution ? 
Statistics
City A has 1,000,000 people; City B has 4,000,000 people. Suppose the goal is to try to predict the percent of Purple Party voters in a sample. Other things being equal, a simple random sample of 1% of the people in City A has about … 
statistics
Suppose you are trying to estimate the percent of women in a city. Other things being equal, a simple random sample of 0.1% of the population of a city that has 2,000,000 people is ________ as a simple random sample of 0.1% of the … 
statistics
Suppose you are trying to estimate the percent of women in a city. Other things being equal, a simple random sample of 0.1% of the population of a city that has 2,000,000 people is ________ as a simple random sample of 0.1% of the … 
STATISTIC***HELP
Show all your work. Indicate clearly the methods you use because you will be graded on the correctness of your methods as well as on the accuracy of your results and explanation. A simple random sample of adults living in a suburb … 
statistic****help*****
Show all your work. Indicate clearly the methods you use because you will be graded on the correctness of your methods as well as on the accuracy of your results and explanation. A simple random sample of adults living in a suburb … 
Statistics
Daily water intake (including water used in drinks such as coffee, tea and juice) for Canadian adults follows a normal distribution with mean 1.86 litres and standard deviation 0.29 litres. (a) Can you calculate the probability that …