Questions from Business Statistics

Q: A television station has been providing live coverage of a sensational criminal

A television station has been providing live coverage of a sensational criminal trial. The station’s program director wants to know if more than half of potential viewers prefer a return to regular da...

Q: One type of error in a hypothesis test is rejecting the null

One type of error in a hypothesis test is rejecting the null hypothesis when it is true. What is the other type of error that might occur when a hypothesis test is carried out?

Q: Suppose that for a particular hypothesis test, the consequences of a

Suppose that for a particular hypothesis test, the consequences of a Type I error are very serious. Would you want to carry out the test using a small significance level a (such as 0.01) or a larger s...

Q: Occasionally, warning flares of the type contained in most automobile emergency

Occasionally, warning flares of the type contained in most automobile emergency kits fail to ignite. A consumer group wants to investigate a claim that the proportion of defective flares made by a par...

Q: A television manufacturer states that at least 90% of its TV

A television manufacturer states that at least 90% of its TV sets will not need service during the first 3 years of operation. A consumer group wants to investigate this statement. A random sample of...

Q: The paper “breast mri as an adjunct to mammography for breast

The paper “breast mri as an adjunct to mammography for breast cancer Screening in high-risk patients” (American Journal of Roentgenology [2015]: 889â€
...

Q: One type of error in a hypothesis test is failing to reject

One type of error in a hypothesis test is failing to reject a false null hypothesis. What is the other type of error that might occur when a hypothesis test is carried out?

Q: Suppose that for a particular hypothesis test, the consequences of a

Suppose that for a particular hypothesis test, the consequences of a Type I error are not very serious, but there are serious consequences associated with making a Type II error. Would you want to car...

Q: A manufacturer of handheld calculators receives large shipments of printed circuits from

A manufacturer of handheld calculators receives large shipments of printed circuits from a supplier. It is too costly and time-consuming to inspect all incoming circuits, so when each shipment arrives...

Q: An automobile manufacturer is considering using robots for part of its assembly

An automobile manufacturer is considering using robots for part of its assembly process. Converting to robots is expensive, so it will be done only if there is strong evidence that the proportion of d...