Assume that 25% of all households in Santa Clara county have a burglar alarm (population characteristic)....
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Assume that 25% of all households in Santa Clara county have a
burglar alarm (population characteristic)....
9. In a population of 5000 subjects, 600 posses a certain characteristic. A sample of 120...
9. In a population of 5000 subjects, 600 posses a certain characteristic. A sample of 120 subjects selected from this population contains 18 subjects who possess the same characteristic. What are the values of the population and sample proportions? 10. In a population of 9500 subjects, 75% have a certain characteristic. In a sample of 400 subjects selected from this population, 78% possess the same characteristic. How many subjects in the population and sample, respectively, possess this characteristic? 11. According...
The Food Marketing Institute shows that of households spend more than per week on groceries. Assume the population...
The Food Marketing Institute shows that of households
spend more than per week on groceries. Assume the
population proportion is and a simple random sample of
households will be selected from the population. Use
z-table.
a. Calculate the sampling distribution of , the
proportion of households spending more than per week on
groceries.
(to 2 decimals)
(to 4 decimals)
b. What is the probability that the sample
proportion will be within of the population proportion
(to 4 decimals)?
eBook The Food Marketing Institute shows that...
Santa Elena is a seacoast community with a population of 99,000. Its residents can be divided...
Santa Elena is a seacoast community with a population of 99,000. Its residents can be divided into three age groups: 25-44, 45-64, and 65+, each comprising one third of the population. In 1990, 100 cases of hepatitis A occurred in Santa Elena and were traced to the consumption of contaminated oysters. Of these 100 cases, 20 between the ages of 25 and 44, 10 between the ages of 45 and 64, and 5 over the age of 64 ultimately proved...
In a large population, 67% of the households have cable tv. A simple random sample of...
In a large population, 67% of the households have cable tv. A simple random sample of 81 households is to be contacted and the sample proportion computed. What is the probability that the sampling distribution of sample porportions is less than 63%?
ian Automotive, 35% of all car-owning households have three or more 5 car ording to the Experi (a) I n a random sam...
ian Automotive, 35% of all car-owning households have three or more 5 car ording to the Experi (a) I n a random sample of 20 car-owning households, wh have three or more cars? at is the probability that exactly In a random sample of 20 car-owning households, what is the probability that less or equal to 4 households have three or more cars? (b) (e) In a random sample of 20 car-owning households, what is the probability that greater than...
Example: According to a survey in a county, 28% of adults do not own a cell...
Example: According to a survey in a county, 28% of adults do not own a cell phone. Suppose a simple random sample of 200 adults is obtained Is the sampling distribution of normal? Why? What is the probability that in a random sample of 200 adults, more than 30% do not own a cell phone? Interpretation: If 100 random samples off 200 adults were obtained, one would expect 30% not owning a cell phone. to result in more than What...
1- In a large population, 67% of the households have cable tv. A simple random sample...
1- In a large population, 67% of the households have cable tv. A simple random sample of 81 households is to be contacted and the sample proportion computed. What is the probability that the sampling distribution of sample porportions is less than 63%?
A Food Marketing Institute found that 28% of households spend more than $125 a week on groceries. Assume the population...
A Food Marketing Institute found that 28% of households spend more than $125 a week on groceries. Assume the population proportion is 0.28 and a simple random sample of 231 households is selected from the population. What is the probability that the sample proportion of households spending more than $125 a week is less than 0.25?
Population 35,093, of those a2,429 people are registered to note In May of 2018, 20% of...
Population 35,093, of those a2,429 people are registered to note In May of 2018, 20% of the registered voters in Scotland County voted in the primary election. 6. About how many people voted? (round to the nearest person) 7. Ir 100 people are randomly selected, what is the probability that at least 15% of them voted in the primary? 8. Ir 200 people are randomly selected, what is the probability that more than 25% of them voted in the primary?...
A Food Marketing Institute found that 30% of households spend more than $125 a week on...
A Food Marketing Institute found that 30% of households spend more than $125 a week on groceries. Assume the population proportion is 0.3 and a simple random sample of 294 households is selected from the population. What is the probability that the sample proportion of households spending more than $125 a week is less than 0.28? Note: You should carefully round any z-values you calculate to 4 decimal places to match wamap's approach and calculations. Answer =
9. In a population of 5000 subjects, 600 posses a certain characteristic. A sample of 120 subjects selected from this population contains 18 subjects who possess the same characteristic. What are the values of the population and sample proportions? 10. In a population of 9500 subjects, 75% have a certain characteristic. In a sample of 400 subjects selected from this population, 78% possess the same characteristic. How many subjects in the population and sample, respectively, possess this characteristic? 11. According...
The Food Marketing Institute shows that of households
spend more than per week on groceries. Assume the
population proportion is and a simple random sample of
households will be selected from the population. Use
z-table.
a. Calculate the sampling distribution of , the
proportion of households spending more than per week on
groceries.
(to 2 decimals)
(to 4 decimals)
b. What is the probability that the sample
proportion will be within of the population proportion
(to 4 decimals)?
eBook The Food Marketing Institute shows that...
Santa Elena is a seacoast community with a population of 99,000. Its residents can be divided into three age groups: 25-44, 45-64, and 65+, each comprising one third of the population. In 1990, 100 cases of hepatitis A occurred in Santa Elena and were traced to the consumption of contaminated oysters. Of these 100 cases, 20 between the ages of 25 and 44, 10 between the ages of 45 and 64, and 5 over the age of 64 ultimately proved...
ian Automotive, 35% of all car-owning households have three or more 5 car ording to the Experi (a) I n a random sample of 20 car-owning households, wh have three or more cars? at is the probability that exactly In a random sample of 20 car-owning households, what is the probability that less or equal to 4 households have three or more cars? (b) (e) In a random sample of 20 car-owning households, what is the probability that greater than...
Example: According to a survey in a county, 28% of adults do not own a cell phone. Suppose a simple random sample of 200 adults is obtained Is the sampling distribution of normal? Why? What is the probability that in a random sample of 200 adults, more than 30% do not own a cell phone? Interpretation: If 100 random samples off 200 adults were obtained, one would expect 30% not owning a cell phone. to result in more than What...
Population 35,093, of those a2,429 people are registered to note In May of 2018, 20% of the registered voters in Scotland County voted in the primary election. 6. About how many people voted? (round to the nearest person) 7. Ir 100 people are randomly selected, what is the probability that at least 15% of them voted in the primary? 8. Ir 200 people are randomly selected, what is the probability that more than 25% of them voted in the primary?...
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