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The mean cost of a wedding is $28732. Suppose the cost for a wedding is normally distributed, with a standard deviation of $1500, and that a wedding is selected at random, what is the probability that the wedding costs more than $32000 and what is the probability it costs between $25000 and $30000.
It is found that among a random sample of 130 of the school's students, 32% of them plan to go into general practice. Find the P-value for a test of the school's claim.
Compare population means or proportions to determine the relationship between variables.
An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of 6.0 emails per hour. Assume the arrival of these emails is approximated by the Poisson distribution.
Duplicate readings, using two separate instruments, were obtained on ten samples. What is the tabular value of the statistic used to determine the significance of the mean difference at the .05 level of probability?
Let X be the number of calls you need to make until you find your friend. Give the probability mass function for X. How many calls do you expect to make until you find your friend?
A dependent samples t test is typically more powerful than an independent samples t test because? Reduces participant/subject variability between groups.
Assume a sample of 400 American adults were taken. Show the sampling distribution of the proportion of adults who balance their checkbook at least once a month.
The rockets are playing Lakers tonight in basketball. The lakers average 90 points a game, with a SD of 10. What would the rockets need to score to be 80% sure of victory, 90% sure, 95% sure.
Telephone calls enter a college switchboard at a mean rate of 2/3 call per minute according to Poisson process. Let X denote the waiting time until the tenth call arrives. what are the moment-generating function, mean and variance of X?
Would you be willing to provide an example of both methods (step by step) described in your document for determining the forecast based upon the two different methods. Maybe just for one single city.
The average number of hours of sleep per night that a college freshman gets is 6.50 with a standard deviation of 1.80 hours. If 35 college freshmen are randomly chosen find the probability that they average at least seven hours of sleep per night.
What are the mean value and standard deviation of the number of students who want new books? What is the probability that the number of students who want new books is more than two standard deviations above the mean?
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