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1. A car rental office checks out an average of 30 cars per day with a standard deviation of 8 cars. If a sample of 25 days of operation is selected and the sample mean is computed. What is the value for the standard error of the mean? What is the probability that the sample mean for the 25 days will be within 27 and 32 cars?
2. In an effort to estimate the mean annual amount spent per customer for groceries at a particular supermarket, data were collected for a sample of 100 households. The sample showed an average amount of $8,000. If the population standard deviation is $500. Develop an 80% then a 85% confidence interval estimate of the population mean annual amount spent. If the data were collected for a sample of 50 households rather than 100, develop an 85% confidence interval estimate of the population mean annual amount spent, assuming the population has a normal probability distribution
Can you conclude that information in article is untrue? Use 0.05 significance level. Find out p-value and explain its meaning.
When studying the simultaneous responses to two categorical questions, we should set up a:
Construct a 90% confidence interval for the proportion of all kernels that would not pop.
To test this notion, eight paid volunteers were placed (individually) in a room in which there was no light from the outside and no clocks or other indications of time.
What is the probability that the first and the last ones on the EP are the relationship songs?
Find a 95% confidence interval for the mean µ of the population from which the men were selected.
Formulate a suitable null and alternative hypothesis to test the students' claim that they followed their instructor's recommendation at a 5% level of significance and interpret your findings.
Sketch the areas under the standard normal curve over the indicated intervals, and find the specified areas.
An analyst thinks that the economic conditions during the next year will either be Strong, Normal or Weak and she thinks that the Simpson Company's returns will have the following probability distribution.
Two sample z-test for the difference between two population proportions
A sample of 100 widgets from the Acme production line shows that the average lifespan of these parts is 900 hours. The standard deviation of production has been 200 hours historically and is known to be normally distributed.
The random variable X has which of the following probability distributions and What is the probability that no student wins
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