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According to a study, it takes an average of 330 minutes for taxpayers to prepare, copy, and mail an income tax return. A consumer watchdog agency selects a random sample of 40 taxpayers and finds the standard deviation of the time to prepare, copy and mail their tax return is 80 minutes.
a. What is the standard error of the mean in this example?b. What is the likelihood the sample mean is greater than 320 minutes?c. What is the likelihood the sample mean is between 320 and 350 minutes?d. What is the likelihood the sample mean is greater than 350 minutes?e. What assumption or assumptions do you need to make about the shape of the population?
According to a report by Scarborough Research, the average monthly household cellular phone bill is $73. Suppose local monthly household cell phone bills are normally distributed with a standard deviation of $11.35.
Compute the skewness for your data set using Pearson's
Which of the following(s) can be considered (a) variable(s)?
Two tools that are often used in this process are the contingency table and the decision tree. What are these tools and how to they help us to make decisions under uncertainty when we are dealing with probabilities?
As a result of an increase in demand for a town's parking facilities, the owners of a car park are reviewing their business operations. A decision has to be made to choose one of the following options:
For the most recent year available the mean annual cost to attend a private university in the US was $26,889. Assume the distribution of annual costs follows a normal probability distribution and the standard deviation is $4,500. 95% of all studen..
Create the 95% confidence interval for proportion of adults from Country A who say human activity contributes to global warming.
The 47 students on a computer studies course each recorded the number of whole minutes, x, spent surfing the internet during a given day. Find the standard deviation SD = σx
The quality-control inspector checks 200 pieces in a certain operation. The piece is either good or defective. The record for nine hours.
A Pool Supply sells all types of billiard equipment, and is considering manufacturing their own brand of pool cues. Mysti Farris, the production manager, is currently investigating the production of a standard house pool cue that should be very po..
A candy confectioner measures the weight of 30 pieces of candy and obtains a mean and standard deviation of 32.5 gms and 2.6 gms, respectively. Construct the 98% confidence interval for the population mean.
What are the differences between a two sample t-test and ANOVA hypothesis testing? When would you use ANOVA at your place of employment, in your education, or in politics?
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