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The average admission charge for a movie is $ 6.05 . If the distribution of movie admission charges is approximately normal with a standard deviation of $ 0.89 . What is the probability that a randomly selected admission charge is between 6 and 8.2 dollars?
A patient is chosen at random from the clinic. What is the probability that the patient's test comes out positive for Lyme disease?
standard deviation of the heights of young men is about 2.8 inches. suppose (unknown to you) the mean height of all male students is 70 inches. you measure 25 students. what is the sampling distribution of their average height x bar?
The shirt was a mesh polo shirt. Given this information, what is ths probability that the mesh polo shirt came from box 1?
The data follow. Males Females 27 25 25 29 19 18 10 23 16 20 22 15 14 19 (a) What statistical test should be used to analyze these data?
Is 0.21, the probability that his wife will vote in the referendum is0.28, and the probability that both the husband and wife will voteis 0.15. What is the probability that: at least one member of a married couple will vote?
Possible test scores could range from 0 to 500. Assume that the scores are normally distributed. Find the probability that a student had a score higher than 320.
What is the approximate probability that the combined weight of 25 items exceeds 445 ounces? What theorem is useful in answering this question?
Whenever the calculated value of t is equal to or greater than the tabled value of t, for a given number of degrees of freedom, then
Ten asthmatics were asked to compare the effect of salbutamol and fenoterol sprays in relieving their asthma attacks. Assume that salbutamol and fenoterol are equal in terms of effectiveness and side effects in all people
A confidence interval increases in width as:
A random sample of stipends of teaching assistants in economics is listed below. Is there sufficient evidence at the alpha=.05 level to conclude that the average stipend different from $15,000? The data is listed below:
The probability that Pete will catch fish when he goes fishing is .8. Pete is going to fish three days next week. Define the random variable x to be the number of day Pete catches fish. (hint. binomial distribution)
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