Continuous Distributions - Data Management If a set of data has a mean of 50 and a standard deviation of 4.5, what is the z-score for a value of 40?
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Q: Mean = %3D (Round to the nearest hundredth.) Standard deviation (Round to the nearest hundredth.)
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A: 68-95-99.7 rule : According to 68-95-99.7 rule , 1) 68% of data falls within the first standard…
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A: Excel formula: =NORMINV(0.305,0,1)=-0.5100
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Q: The coefficient of variation CV describes the standard deviation as a percent of the mean. Because…
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A: From the provided information, Population mean (µ) = 98.20 Population standard deviation (σ) = 0.62
Q: z-score: The z-score corresponding to an observed value tells us the: A. value of the…
A: The z-score is the measure of how far the standard deviation away from the mean (Above/ below the…
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Q: A company sells printers with a mean life of 2 years (24 months) and a standard deviation of 4…
A: GIVEN: mean = 24 months standard deviation = 4 months
Q: Ages of Gamblers The mean age of a sample of 24 people who were playing the slot machines is 50.6…
A: Given,n1=24n2=32x1=50.6s1=6.8x2 =55.6s2=3.2α=0.10H0:μ1=μ2H1:μ1<μ2
Q: What information can you get from a person’s z-score? Whether they are closer or farther from the…
A: Given that, What information can you get from a person’s z-score? Whether they are closer or…
Q: How to find standar deviation and an example
A: The formula for standard deviation can be defined as:
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A: given data, random variable x represent the number of emails received at a help desk in one hour…
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A: Given data,Mean μ=100standard deviation σ=15Score is x=125z-score=?
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Q: Grades in an exam are normally distributed with a mean of 60 and a standard deviation of 10. What is…
A: We have given the following information. Population mean = 60 Population standard deviation = 10.
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A: It is given that the mean is 268 and the standard deviation is 15.
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Q: received a score below 63 Half the scores to fall between 70 and 83 NO Half the scores to fal
A: We have, μ=75σ=6 We will see all the five cases. 1). In the first case, we will find the…
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- Details The scores on a standardized test are normally distributed with a mean of 90 and standard deviation of 8. What test score is 4 standard deviations below the mean?Accordi the historical data, the life expectancy in Mexico is equal to the life expectancy in Spain. A new study has been made to see whether this has changea. Records of 205 individuals from Mexico who died recently are selected at random. The 205 individuals lived an average of 71.8 years with a standard deviation of 2.6 years. Records of 250 individuals from Spain who died recently are selected at random and independently. The 250 individuals lived an average of 71.2 years with a standard deviation of 3.0 years. Assume that the population standard deviation of the life expectancy can be estimated by the sample standard deviations, since the samples that are used to compute them are quite large. At the 0.05 level of significance, is there enough evidence to support the claim that the life expectancy, H1, in Mexico is not equal to the life expectancy, µ,, in Spain anymore? Perform a two-tailed test. Then complete the parts below. Carry your intermediate computations to at least three…I Professor Brown administered an achievement test, which as he remembers from years of experience, yielded a population mean score of 85. If his class of 25 students obtained a mean score of 89 with standard deviation score of 14, can the professor claim that his class is a superior class? Assume that the mean score is approximately normally distributed. Use a = 0.01
- Help!The data in the table is points scored by a basketball team in a certain period of time. Use the data in the table to answer the bulleted statements.IQ scores of people around the world are normally distributed, with a mean of 100 and a standard deviation of 15. A genius is someone with an IQ greater than or equal to 145. What percent of the population is considered a genius? answer as a percent rounded to 2 decimal places
- The coefficient of variation CV describes the standard deviation as a percent of the mean. Because it has no units, you can use the coefficient of variation to compare data with different units. Find the coefficient of variation for each sample data set. What can you conclude? Heights Weights77 19379 20569 22379 22077 22572 17965 20173 21071 19670 20475 21379 209 CV heights= % CV weights = % what can you conclude?z Scores LeBron James, one of the most successful basketball players of all time, has a height of 6 feet 8 inches, or 203 cm. Based on statistics from Data Set 1 “Body Data” in Appendix B, his height converts to the z score of 4.07. How many standard deviations is his height above the mean?Scores on an English test are normally distributed with a mean of 37.3 and a standard deviation of 8. Find the score that represents the 59th percentile. 59th Percentile = (Round to 1 decimal)