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The daily receipts of a fast-food franchise are normally distributed with a mean of $2,200 per day and a standard deviation of $50. A random sample of 25 days' receipts is chosen for an audit. What is the probability that the sample mean is larger than $2,220?
A professor is targeting a score of 80 on an exam. His forty-nine students averaged 78 on an exam with s = 7. Are the scores significantly less than 80 at a significance level of 0.05? Show your work and state the conclusion.
Determine the probability that 5 or less questionnaires will be returned? Compute also probability that 7 or more questionnaires will be returned.
If sample mean is M=44. Is this sufficient to demonstrate significant effect? Again assume a Two-tailed test with a=0.05.
The means of two normally distributed populations, where the unknown population variances are assumed to not be equal. What is the upper confidence limit is?
Find the confidence interval of the true proportion of students to receive a 3.0 GPA. Find the Z score, standard error, range, and your conclusion in a sentence.
Describe the difference in the fit provided by the two estimated regression equations.
Interpret the estimated tolerance intervals and the confidence interval in the context of the situation related to the exercise.
You are a realtor with a small business. You use a simple 2 variable linear regression analysis for quick first glance house price estimates using square footage of the house.
Specify the appropriate null and alternative hypotheses if we wish to test the research hypothesis that the mean GHQ score for all employed men exceeds 10.
You have an observed mean of 55, an observed standard deviation of 12. Which Z value is associated with each raw score below?
Develop a probability for the number of students in the sample who watch soap operas.
A marketing agency has developed three vacation packages to promote a timeshare plan at a new resort. They estimate that 20% of potential customers will choose the day plan
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