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Suppose the age of buyers were collected and the data follows the bell curve (a normal distribution). The buyers had an average age of 41 years and a standard deviation of 7. You plan to take a random sample of 68 buyers and calculate a sample mean. Directions: Fill in the blanks and click the button to have your answers graded.A. Do not round intermediate calculations. B. For questions 1-3 enter a number between 0 and 1 rounding it to four places.C. Round your answer to question 4 to two decimal places.1. What is the probability of finding a sample mean less than 40.96 years? = 2. What is the chance of finding a sample average with a value greater than 41.84 years? = 3. What is the probability of finding a sample average within 2.16 years of the population mean? = 4. What two values of the sample mean cut off the center 16% of the sampling distribution?Lower Value: = Upper Value: =
1)Customers enter a store according to a Poisson process of rate A = 6 per hour. Suppose it is known that but a single customer entered during the first hour. What is the conditional probability that this person entered during the first fifteen minut..
Deceptive Statistics
Use Markov's inequality to get an upper bound
IQ scores from the general population form a normal distribution with a μ = 100 and σ = 15. However, data indicate that children's intelligence may be affected if their mothers have German measles during pregnancy.
Consider a sample of 148 small businesses. During a three-year period, 15 of 106 headed by men and 7 of the 42 headed by women failed. Let p1 be the proportion of businesses headed by women that failed. Let p2 be the proportion of businesse..
A statistics professor plans class so carefully that the lengths of his classes are uniformly distributed between 45.0 and 55.0 minutes. find the probability that a given class period runs greater than 50.75 minutes? find the probability of se..
Develop a scatter diagram for these data. Try to approximate the relationship between x and y by drawing a straight line through the data.
Carry out a validation study, an I/O psychologist is developing a regression equation from data collected from those hired two years ago.
In a normal distribution of measurements having a mean of 500 feet and a standard deviation of 50 feet, what percent of the distribution falls between 490 and 520 feet?
What kind of experiment
What proportion of trucks can be expected to travel between 80,000 and 120,000 kilometres in the year and what percentage of trucks can be expected to travel either below 60,000 or above 140,000 kilometres in the year -How many kilometres will be tra..
Nicotine Absent Nicotine PresentSelf-Reported Non-Smoker 82 14Self-Reported Smoker 12 52A. What is the probability that at least 3 are hyperlipidemic?
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