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A srudy in southern california claimed that the mean commute time for all employees working in orange county exceeds 40 minutes. this figur is higher that what was the mean commute time estimated in previous studies cnducted in the past. the plan is to test this claim using an alpa level of 55 and a sample size of n=100 commuters. the sample mean for the 100 commuters is equal to 43.5 minutes and based on previous studies, the population standard deviation is known to be 8 minutes. creates a hypothesis test to determine if the mean commute time does in fact exceed 40 minutes.
State the null and alternative hypotheses to determine if the average number of hours until spoilage begins differs for the preservatives A and B?
A marketing survey is conducting in which students are to taste two different brands of soft drink. Their task is to currently identify the brand tasted.
A farm brings 15 tons of watermelon to market. Find a 90% confidence interval for the population mean cash value of this crop. What is the margin of error?
Make a decision regarding the null hypothesis based on the sample information. Interpret the results of the test and state your conclusion.
What is the expected number of contracts that it will win? What is the expected profit for each contract? What is the company's expected total profit on these three bids?
Explain the difference between multiple independent variables and multiple levels of independent variables. Which is better?
Can one conclude at a level of significance of .01 that the new ball has improved his game?
Using the basic informaion from above: If there are no additional customers waiting (or walking up to the counter) when a particular customer begins her transaction, what is the probability that no one will be waiting in line when her transaction ..
A particular fast food restaurant is located near a University. 40% of the customers are students. Students prefer the spicier items.
Find an equation of the least squares regression line. Please show your work. Is there a linear correlation between "x" and "y" at the 0.01 significance level? Please justify your answer.
What is the upper limit of the 95% interval? Give your answer to three decimal places. Which of the following assumptions should be checked before constructing the above confidence interval?
Let Z be the random variable giving the number of times the second biased coin (coin #2) comes up heads. What is the probability mass function of Z? What is the mean and variance of Z?
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