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Suppose that the referee for a football game has two coins that look the same, except that one of them is fair and the other is weighted to fall heads with probability .85. The referee doesn't know which is which, and decides to select one of them and ?ip it 20 times and if it lands heads 17 times or more then the referee will designate that coin as the weighted one.
a) If the coin the referee selects is fair, what is the probability that it gets designated as being weighted?
b) If the coin is weighted, what is the probability that the test designates it as being weighted?
A 1990 census report revealed that the mean distance that U. S. citizens live from their birthplace is 50 miles and that the standard deviation is 15 miles. A random sample of 49 residents of your city yielded a mean distance of 56 miles.
The famous YS Chang restaurant is open 24 hours a day. Waiters and busboys report for duty at 3am, 7am, 11am, 3pm, 7pm, or 11pm, and each works an 8 hour shift. The following table shows the minimum number of workers needed during the six periods ..
Describe the purpose of transforming raw scores into standard scores. Describe what "normal distribution" means.
Based on the information in part (a), what decision should the director make about the books used for the courses if the goal is to keep the cost below $300?
Suppose that 20% of all Internet users have posted photos online. A sample survey interviews 1555 users. What is the probability that 300 or fewer people in the sample have posted photos online?
Critically illustrate out the characteristics of a standard normal distribution? Can two distributions with the same mean and different standard distributions be considered normal?
When testing for a difference between the means of a treatment and a placebo group, the computer display below is obtained. using a 0.05 significance level, is there sufficient evidence to support the claim that the treatment group (variable 1) co..
Determine the mode for this distribution. Describe why you can't calculate the mean number of times using data in the table.
A study was completed that examined the relationship between coffee consumption and level of stress for a group of 50 undergraduate students. The correlation was .373, and it was a two-tailed test, done at the .01 level of significance.
New population of pilots has normally distributed weights with mean of 128 lb and standard deviation of 31.7 lbs. If the pilot is randomly selected, determine the probability that his weight is between 120 lb and 181 lb.
An auditor reviewed 25 oral surgery insurance claims from a particular surgical office, determining that the mean out-of-pocket patient billing above the reimbursed amount was $275.66 with a standard deviation of $78.11.
Describe a study you might design that could use the Chi Square statistic. What are the variables? What are the null and alternative hypotheses? Why would the Chi Square test be appropriate for this design?
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