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About 15% of the populaiton are hopelessly romantic. If two people are randomly selected, what is the probability both are hopelessly romantic? What is the probability at least one is hopelessly romantic.
Normal with mean 48 months and standard deviation 9 months. The company has decided to give a guarantee for the sensors for 3 years. What % age of the sensors will not satisfy the guarantee.
Sketch the areas under the standard normal curve over the indicated intervals, and find the specified areas.
In a lengthy manuscript, it is found that only 2/3 of the pages contain no typing errors. Assume that the number of errors per page has a Poisson distribution.
A recent study of minimum wage earners found that 51.3% of them are 16 to 24. suppose a sample of 600 minimum wage earners is selected. is it appropriate to use the normal approximation to the binomial distribution.
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?
A player of a video game is confronted with a series of opponents and has an 80% probability of defeating each one. Success with any opponent is independent of previous encounters. The player continues to confront opponents until defeated.
Sampling area consisted of an area of 120m x 50m within site two and was bordered by a road on one side and a stream on another.
In a randomized clinical trial of timolol vs. placebo in patients surviving acute myocardial infarction, the total deaths at an average of 24 months after treatment were found to be 65 out of 720 in the Timolol group and 112 out of 860 in the plac..
The maker of refrigerators buys bolts from two suppliers, and it is very important that the mean widths of the bolts received from both suppliers are equal since they must be used interchangeably.
We wish to compare the average sales in two shops, to see if the population mean of the first one is higher than the second one. One shop had 100 sales averaging $94, with a standard deviation of $40.
Critically discuss the difference between the standard deviation of the sampling distribution of the mean and the standard deviation of the sampling distribution of the median when we calculate the probability?
20 students in a class - if there is a 15% probability that a randomly chosen member has seen a particular movie - what is the expected number of students have seen the movie?
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