A health economist does a study on the average life expectancy of every country in Europe.  The country of Fredonia (no, it’s not a real country) has a life expectancy of 81.2 years.  This gives it a z-score of +0.8.  If the life expectancies of all the countries in Europe have a mean of 80.1 years, then what is the standard deviation of all the life expectancies of all the countries in Europe? Group of answer choices Standard deviation = 2.24 Standard deviation = 3.00

Q: The U.S. Center for Disease Control reports that in year 1900, the mean life expectancy is 47.6…

A: Given  nw=117, x¯w=46.7 and  sw=11.4 And           nnw=86, x¯nw=38.4 and  snw=15.4

Q: The tallest living man at one time had a height of 261 cm. The shortest living man at that time had…

A:

Q: c. Find the p-value. Round to 4 decimals. p-value = d. Make a decision. O Fail to reject the null…

A: Given : Mean : x1 = 46.9x2 = 36.2 standard deviation : σ1 = 12.4σ2 = 15.3 Sample size : n1 = 124n2 =…

Q: The gestation period for human births can be taken as normally distributed with a mean of 256 days…

A:

Q: In New York State, the population of teachers is known to have an average of 12.2 years of classroom…

A:

Q: A recent poll found that 59% of adults believe the state of moral values is poor. For 400 randomly…

A: Here, n = 400 and p = 0.59

Q: The weights of men in their 30s are normally distributed with a mean of 190 pounds and a standard…

A: From the provided information, Population mean (µ) = 190 pounds Population standard deviation (σ) =…

Q: An IQ exam has a mean of 110 and a standard deviation of 12. What percent of people have an IQ score…

A: Given mean= 110 Standard deviation=12 We know that Z=X-mean/standard deviation

Q: Suppose we have data on the ages of U.S. presidents. We also have ages for a sample of high school…

A:

Q: health economist does a study on the average life expectancy of every country in Europe.  The…

A: Given, mean life of the country is 81.2 and standard deviation is 3.7. Z-score is 1.2. We will use…

Q: An advertising agency has stated that 20% of all television viewers watch a particular program. How…

A: From the provided information, An advertising agency has stated that 20% of all television viewers…

Q: if a student scored 88 points on a test when the mean score was 80.2 and the standard deviation was…

A: From the provided information, Mean (µ) = 80.2 Standard deviation (σ) = 5.7

Q: According to the historical data, the life expectancy in Belgium is less than the life expectancy in…

A:

Q: Suppose​ 18% of​ movie-goers say that horror is their favorite movie genre. If a random sample of…

A: Obtain the mean number of movie-goers that prefer horror movie genre. The mean number of movie-goers…

Q: Assume the cholesterol levels of adult American women can be described by a Normal model with a mean…

A: According to the given information, we have Mean = 188 mg/dL Standard deviation = 24 mg/dL

Q: The time taken to boil a kettle is normally  distributed with a mean of 94 seconds and  a standard…

A: The provided information is  µ=94 σ=6 P(-a<X<a)=0.40…

Q: The U.S. Center for Disease Control reports that the mean life expectancy was 47.6 years for whites…

A: a.) The Hypotheses The hypotheses are: H0​:μW​=μNW​H1​:μW​=μNW​ b.) The Test Statistic The…

Q: A normal population has a mean= 61 and standard deviation=16. what proportion of the population is…

A: From the provided information, Mean (µ) = 61 Standard deviation (σ) = 16 X~N (61, 16)

Q: According to the historical data, the life expectancy in the United States is less than the life…

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Q: Suppose the prevalence of type II diabetes in a community is 36%. Researchers want to sample 16…

A:

Q: One year, many college-bound high school seniors in the US took the SAT. For the verbal portion of…

A: According to the given information in this question We need to find the percentage of students would…

Q: According to the historical data, the life expectancy in Germany is less than the life expectancy in…

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Q: A set of math test scores has a mean of 70 and a standard deviation of 8.  A set of English test…

A: Consider that the mean and standard deviation of a random variable x are µ and σ, respectively.…

Q: On Bob's last history test, he had a score of 92.  Bob's z-score was -0.5, and the test's standard…

A: Solution -Given that Score in History test be X=92 Z- Score=-0.50 Standard deviation= 6 Find mean…

Q: Suppose that the life-span of goldfish can be modeled by the Normal Distribution with a mean of 5…

A:

Q: A bank loan officer rates applicants for credit. The ratings can be described by a normal model with…

A: Given: μ = ​200 σ = 50

Q: A student will spend 15 hours average each week in class. If the standard deviation is 2 hours, what…

A: Given that mean=15 and standard deviation = 2 Let, X= number of hours spent by a student in the…

Q: Suppose that the amount of caffeine (in milligrams) in an 16 fluid ounce energy drink can be modeled…

A: the PDF of normal distribution is = 1/σ * √2π * e ^ -(x-u)^2/ 2σ^2standard normal distribution is a…

Q: Can the standard deviation of a data set be zero

A: Standard deviation can not be negative.