A toy manufacturer wants to know how many new toys children buy each year. Assume a...
A toy manufacturer wants to know how many new toys children buy each year. Assume a previous study found the variance to be 1.69. She thinks the mean is 5.8 toys per year. What is the minimum sample size required to ensure that the estimate has an error of at most 0.13 at the 95% level of confidence? Round your answer up to the next integer.
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A toy manufacturer wants to know how many new toys children buy
each year. Assume a...
A toy manufacturer wants to know how many new toys children buy each year. Assume a...
A toy manufacturer wants to know how many new toys children buy each year. Assume a previous study found the standard deviation to be 1.8 She thinks the mean is 5.8 toys per year. What is the minimum sample size required to ensure that the estimate has an error of at most 0.12 at the 80% level of confidence? Round your answer up to the next integer.
A toy manufacturer wants to know how many new toys children buy each year. Assume a...
A toy manufacturer wants to know how many new toys children buy each year. Assume a previous study found the standard deviation to be 2. He thinks the mean is 5.2 toys per year. What is the minimum sample size required to ensure that the estimate has an error of at most 0.15 at the 80% level of confidence? Round your answer up to the next integer.
A software developer wants to know how many new computer games people buy each year. Assume...
A software developer wants to know how many new computer games people buy each year. Assume a previous study found the variance to be 2.25. He thinks the mean is 6.3 computer games per year. What is the minimum sample size required to ensure that the estimate has an error of at most 0.13 at the 80% level of confidence? Round your answer up to the next integer.
A toy manufacturer wants to know how many new toys children buy each year. A sample...
A toy manufacturer wants to know how many new toys children buy each year. A sample of 520520 children was taken to study their purchasing habits. Construct the 85%85% confidence interval for the mean number of toys purchased each year if the sample mean was found to be 6.66.6. Assume that the population standard deviation is 22. Round your answers to one decimal place.
A toy manufacturer wants to know how many new toys children buy each year. A sample...
A toy manufacturer wants to know how many new toys children buy each year. A sample of 520 children was taken to study their purchasing habits. Construct the 85% confidence interval for the mean number of toys purchased each year if the sample mean was found to be 6.6. Assume that the population standard deviation is 2. Round your answers to one decimal place. Lower Endpoint Upper Endpoint
A toy company wants to know the mean number of new toys per child bought each...
A toy company wants to know the mean number of new toys per child bought each year. Marketing strategists at the toy company collect data from the parents of 50 randomly selected children. The sample mean is found to be 4.7 toys per child, and the sample standard deviation is calculated to be 1.5 toys per child per year. Assume that the population standard deviation is known to be 1.9 toys per child per year. Find the error of estimate...
A fashion designer wants to know how many new dresses women buy each year. A sample...
A fashion designer wants to know how many new dresses women buy each year. A sample of 523 women was taken to study their purchasing habits. Construct the 95 % confidence interval for the mean number of dresses purchased each year if the sample mean was found to be 7.3. Assume that the population standard deviation is 1.4. Round your answers to one decimal place. Answer/How to Enter) 4 Points Tables Keypad Lower endpoint Upper endpoint: here to search A...
(5) A research scientist wants to know how many times per hour a certain strand of bacteria repro...
(5) A research scientist wants to know how many times per hour a certain strand of bacteria reproduces. He wants to construct the 75% confidence interval with a maximum error of 0.1 reproductions per hour. (a) Assuming that the mean is 6.1 reproductions and the variance is known to be 5.76, what is the minimum sample size required for the estimate? Round your answer up to the next integer. (6 points) (b) If one uses Chebyshev's Inequality (Law of Large...
i need help with this questiong ASAP An educational psychologist wishes to know the mean number of words a third gra...
i need help with this questiong ASAP
An educational psychologist wishes to know the mean number of words a third grader can read per minute. She wants to ensure that the estimate has an error of at most 0.28 words per minute. A previous study found that the mean was 26.7 words per minute. Assuming that the variance is 7.29, what is the minimum number of third graders that must be included in a sample to construct the 90 %...
An educational psychologist wishes to know the mean number of words a third grader can read...
An educational psychologist wishes to know the mean number of words a third grader can read per minute. She wants to ensure that the estimate has an error of at most 0.25 words per minute. a previous study found that the mean was 25.8 words per minute. assuming that the variance is 9.61. what is the minimum number of third graders that must be included in a sample to construct the 98% confidence interval
A fashion designer wants to know how many new dresses women buy each year. A sample of 523 women was taken to study their purchasing habits. Construct the 95 % confidence interval for the mean number of dresses purchased each year if the sample mean was found to be 7.3. Assume that the population standard deviation is 1.4. Round your answers to one decimal place. Answer/How to Enter) 4 Points Tables Keypad Lower endpoint Upper endpoint: here to search A...
(5) A research scientist wants to know how many times per hour a certain strand of bacteria reproduces. He wants to construct the 75% confidence interval with a maximum error of 0.1 reproductions per hour. (a) Assuming that the mean is 6.1 reproductions and the variance is known to be 5.76, what is the minimum sample size required for the estimate? Round your answer up to the next integer. (6 points) (b) If one uses Chebyshev's Inequality (Law of Large...
i need help with this questiong ASAP
An educational psychologist wishes to know the mean number of words a third grader can read per minute. She wants to ensure that the estimate has an error of at most 0.28 words per minute. A previous study found that the mean was 26.7 words per minute. Assuming that the variance is 7.29, what is the minimum number of third graders that must be included in a sample to construct the 90 %...
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