If a population proportion is believed to be 0.6, how many items must be sampled to ensure that the sampling distribution of p ^ will be approximately normal? Assume that the size of the population is N = 10,000.
The National Association of Realtors estimates that 23% of all homes purchased in 2004 were considered investment properties. If a sample of 800 homes sold in 2004 is obtained what is the probability that at least 175 homes are going to be used as investment property?
The National Association of Realtors estimates that 23% of all homes purchased in 2004 were considered investment properties. If a sample of 800 homes sold in 2004 is obtained what is the probability that at most 200 homes are going to be used as investment property?
A greenhouse in a tri-county area has kept track of its customers for the last several years and has determined that 28% of its customers plant a vegetable garden in the spring. The greenhouse obtains a random sample of 1000 of its customers. What is the mean of the sampling distribution of p ^ , the sample proportion of customers that plant a vegetable garden in the spring?
Smith is a weld inspector at a shipyard. He knows from keeping track of good and substandard welds that for the afternoon shift 5% of all welds done will be substandard. If Smith checks 300 of the 7500 welds completed that shift, what is the probability that he will find more than 25 substandard welds?
Smith is a weld inspector at a shipyard. He knows from keeping track of good and substandard welds that for the afternoon shift 5% of all welds done will be substandard. If Smith checks 300 of the 7500 welds completed that shift, what is the probability that he will find less than 20 substandard welds?
According to a study conducted in one city, 38% of adults in the city have credit card debts of more than $2000. A simple random sample of n = 100 adults is obtained from the city. Describe the sampling distribution of p ^ , the sample proportion of adults who have credit card debts of more than $2000.
A national caterer determined that 37% of the people who sampled their food said that it was delicious. A random sample of 144 people is obtained from a population of 5000. The 144 people are asked to sample the catererʹs food. If p ^ is the sample proportion saying that the food is delicious, what is the standard deviation of the sampling distribution of p ^
A simple random sample of size n = 1040 is obtained from a population whose size is N = 1,200,000 and whose population proportion with a specified characteristic is p = 0.32. Describe the sampling distribution of p ^ .
A national caterer determined that 87% of the people who sampled their food said that it was delicious. A random sample of 144 people is obtained from a population of 5000. The 144 people are asked to sample the catererʹs food. If p ^ is the sample proportion saying that the food is delicious, what is the mean of the sampling distribution of p ^ ?
A greenhouse in a tri-county area has kept track of its customers for the last several years and has determined that it has about 10,000 regular customers. Of those customers, 28% of them plant a vegetable garden in the spring. The greenhouse obtains a random sample of 800 of its customers. Is it safe to assume that the sampling distribution of p ^ , the sample proportion of customers that plant a vegetable garden, is approximately normal? Answer Yes or No.
A national caterer determined that 87% of the people who sampled their food said that it was delicious. A random sample of 144 people is obtained from a population of 5000. The 144 people are asked to sample the catererʹs food. Will the distribution of p ^ , the sample proportion saying that the food is delicious, be approximately normal? Answer Yes or No.
Professor Whata Guy surveyed a random sample of 420 statistics students. One of the questions was ʺWill you take another mathematics class?ʺ The results showed that 252 of the students said yes. What is the sample proportion, p ^ of students who say they will take another math class?
To assess attitudes towards issues that affect the residents of a village, the village randomly chose 800 families to participate in a survey of life attitudes. The village received 628 completed surveys. What is the sample proportion of completed surveys?
The amount of time it takes a student to walk from her home to class has a skewed right distribution with a mean of 14 minutes and a standard deviation of 1 minutes. If data were collected from 40 randomly selected walks, describe the sampling distribution of x, the sample mean time.
John has six bills of paper money in the following denominations: $1, $5, $10, $20, $50, and $100 If he selects 3 bills at a time what is the probability of selecting a group that has an average value of at least $26?
John has six bills of paper money in the following denominations: $1, $5, $10, $20, $50, and $100 If he selects 3 bills at a time what is the probability of selecting a group that has an average value of equal to or less than $25?
John has six bills of paper money in the following denominations: $1, $5, $10, $20, $50, and $100 If he selects 3 bills at a time what is the probability of selecting a group that has an average value of between $40 and $45?
John has six bills of paper money in the following denominations: $1, $5, $10, $20, $50, and $100 If he selects 3 bills at a time how many, how many groups can be formed?
The owner of a computer repair shop has determined that their daily revenue has mean $7200 and standard deviation $1200. The daily revenue totals for the next 30 days will be monitored. What is the probability that the mean daily revenue for the next 30 days will be between $7000 and $7500?
The owner of a computer repair shop has determined that their daily revenue has mean $7200 and standard deviation $1200. The daily revenue totals for the next 30 days will be monitored. What is the probability that the mean daily revenue for the next 30 days will be less than $7000?