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How many months must be sampled for analysis to be 99% confidence that the error in estimating the average monthly price of gasoline is at most $0.03. Assume the standard deviation is $ 0.05.
Scores on certain nationwide college entrance examination follow normal distribution with mean of 500 and a standard deviation of 100. Determine the probability that student will score?
Length of smoking time was recorded for each. Mean was =140 hours. Suppose = 8 hours. Determine 95% confidence interval for mean amount of time grocery-store ham is smoked.
Fix-It Copiers advertises mean time of 100 minutes for office calls with standard deviation of 25 minutes. What percentages of calls are completed?
At 0.05 level of significance, is there evidence of significant relationship between age group and where people mainly get their news? If so, describe the relationship.
he length of time a person spends waiting in a physician's office for an appointment can be a frustrating experience. The results below are the responses of internists from two multispecialty group practices to the following question:
Does this data indicate that the sentiment for increasing the speed limit is different for the two groups of residents? Let p1 refer to the urban population.
Describe a hypothesis related to the area of psychology in which you are predicting an interaction. Describe the specific nature of the interaction and why you think an interaction would occur.
If a garage is robbed, what is the probability the doors were left open?
The formula C=5/9 (F-32) , where F is equal to or more than -459.6, represents Celsius temperature C as a function of Fahrenheit temperature F.
You are considering adding a new food product to your store for resale. Explain how many units of the new product should be purchased for resale.
A simple random sample of 400 trees is selected, and the sample mean age of these trees is computed. We know the random variable has an approximately normal distribution because of?
If two people are randomly selected, what is the probability both are hopelessly romantic? What is the probability at least one is hopelessly romantic.
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