David H.

Suppose the mean income of firms in the industry for a year is 65 million dollars with a standard deviation of 1 million dollars. If incomes for the industry are distributed normally, what is the... more

You wish to test the following claim (Ha) at a significance level of a=0.10.      Ho:p=0.16      Ha:p>0.16You obtain a sample of size n=522 in which there are 110 successful observations. For... more

You wish to test the following claim (Ha) at a significance level of a=0.10.      Ho:p=0.16      Ha:p>0.16You obtain a sample of size n=522 in which there are 110 successful observations. For... more

A political candidate has asked you to conduct a poll to determine what percentage of people support her.If the candidate only wants a 7% margin of error at a 90% confidence level, what size of... more

µ = 74.7 and σ = 91.6. If a random sample of size n= 139 is selected, a. What is the mean of the distribution of sample means?b. What is the standard deviation of the distribution of sample means?

A pharmaceutical company receives large shipments of aspirin tablets. The acceptance sampling plan is to randomly select and test 49 ​tablets, then accept the whole batch if there is only one or... more