A many of children,s toys has non conformance rate of 2.0%. what is the probabilty more...
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.
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 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.
In an effort to make children’s toys safer and more tamperproof, toy packaging has become cumbersome for parents to remove in many cases. Accordingly, the director of marketing at Toys4Tots, a large toy manufacturer, wants to evaluate the effectiveness of a new packaging design that engineers claim will reduce customer complaints by more than 10 percentage points. Customer satisfaction surveys were sent to 230 parents who registered toys packaged under the old design and 230 parents who registered toys packaged...
The Toys-R-4-U Company has developed two new toys for possible inclusion in its product line for the upcoming Christmas season. Setting up the production facilities to begin production would cost $50,000 for toy 1 and $80,000 for toy 2. The toys would generate a unit profit of $10 for toy 1 and $15 for toy 2. The company has two factories that are capable of producing these toys. However, to avoid doubling the start-up costs, just one factory would be...
In an effort to make children's toys safer and more tamperproof, toy packaging has become cumbersome for parents to remove in many cases. Accordingly, the director of marketing at Toys4 Tots, a large toy manufacturer, wants to evaluate the effectiveness of a new packaging design that engineers claim will reduce customer complaints by more than 10 percentage points. Customer satisfaction vho registered toys packaged under the old design and 230 parents who registered toys packaged under the new design. Of...
2. Does TV make kids want to buy toys? Watching television has been linked to many problems in children, including obesity. Could it also be linked to asking for toys? How do we make children stop asking for toys? Could it be just turning off the television? A recent study taught 88 third- and fourth-graders a series of 18 mini- lessons in school over a six-month period, aimed at helping them learn to watch television within a budgeted amount of...
Binomial Distributions Given your statistical knowledge, you have been asked to assist the quality control manager of a local manufacturer in establishing and seeing that the factory conforms to standards set by management. The facility manufactures a new electronic toy. The factory can produce 1000 toys per day. Management has indicated that initially they will be satisfied if the defect rate is 3% or less. Since you can’t quality-test every toy produced, you suggest that a random sample of 40...
In an effort to make children’s toys safer and more tamperproof, toy packaging has become cumbersome for parents to remove in many cases. Accordingly, the director of marketing at Toys4Tots, a large toy manufacturer, wants to evaluate the effectiveness of a new packaging design that engineers claim will reduce customer complaints by more than 10 percentage points. Customer satisfaction surveys were sent to 250 parents who registered toys packaged under the old design and 250 parents who registered toys packaged...
A recent study conducted by the Crimes against Children Research Center has found that bullies tend to be victims of crime more often than non-bullies. Suppose the average number of victimizations for all children who are bullies is 3.0 with a standard deviation of 1.4. You take a sample of 49 children who have been identified as bullies by their peers and ask them to report the number of times they have been victimized. You calculate the mean number of...