A sociologist found that in a sample of 50 retired men, the average number of jobs they had during their lifetimes was 7.2. The population standard deviation is 2.1.  Find the margin of error: ? Find the 99% confidence interval of the mean number of jobs: ? The choices are attached (same choices for both questions). Kindly answer both questions PLEASE. I'll give rate. Thanks.

Q: sample of 36 students to answer the question, “How anxious do you feel when you know you have to do…

A: Given that  Sample size (n) =36 Sample mean (x¯) = 58 Sample Standard deviation (s) = 30 Confidence…

Q: Sergio is doing a long hike and is carefully calculating his pack weight. An energy bar has mean…

A: An energy bar has mean weight 1.75 ounces An energy bar has standard deviation 0.019. A juice box…

Q: A survey was conducted that asked 1008 people how many books they had read in the past year. Results…

A: Given X-bar=11.8 S=16.6

Q: The height of an adult male is known to be normally distributed with of mean of 69 inches and a…

A:

Q: A class of 30 62.171 students took a quiz worth 50 points. The standard deviation of the scores was…

A: Standard deviation of sample is given by

Q: aul received a score of 79 on a history test for which the class mean was 70 with a standard…

A:

Q: Choose a quantitative variable.  Measure it on two different samples of 10, drawn from two different…

A:

Q: This looks like another problem. Read carefully. Sergio is doing a long hike and is carefully…

A:

Q: Suppose the scores of students on an exam are normally distributed with a mean of 276 and a standard…

A: X~N(μ= 276 , σ= 59 ) μ= 276 , σ= 59 Formula for Z-score Z=(X-μ)/σ

Q: According to the Institute of Medicine, the tolerable upper level of sodium intake for adults and…

A: Solution :  Given : μ = 2300 mg             n = 14             x¯ = 2310              s = 38 mg…

Q: A sport analyst wants to determine the mean salary of a Baseball player for 2015. He believes an…

A:

Q: 11. MENSA, the high IQ society, only accepts membership into their organization if an applicant's IQ…

A: Given Data Population Mean,μ = 100.0 Population Standard Deviation,σ = 15.0

Q: parent would spend on their child's birthday gift (use a 99% confidence level). Give your answers to…

A:

Q: eenage boys often complain that auto insurance costs more, on average, for teenage boys than for…

A: Given, Parents of teenage boys often complain that auto insurance costs more, on average, for…

Q: According to a local newspaper, students at a local university usually take 4.5 years to graduate. A…

A: 1) Here the parameter is that average number of years required to graduate. Thus, μ=4.5 Claim: A…

Q: The average and standard deviation for ACT scores are 20 and 3 respectively. average and standard…

A:

Q: 2. I want to create a confidence interval for the salaries of statistics teachers in America. I want…

A:

Q: e are two major tests of readiness for college, the ACT and the SAT. ACT scores are reported on a…

A: For ACT scores:Mean of the distribution, Standard deviation of the distribution, The distribution of…

Q: Sergio is doing a long hike and is carefully calculating his pack weight. An energy bar has mean…

A: Given that an energy bar has mean weight 2.28 ounces and standard deviation 0.061. A juice box has…

Q: Consider a value to be significantly low if its z score less than or equal to -2 or consider a value…

A: Here, mean is 19.5 and standard deviation is 4.6.

Q: You need to estimate the mean number of travel days per year for sales people. The mean of a small…

A: Given that : Standard deviation σ = 12 days Margin of error (E)= 3 We have to find 80% confidence…

Q: A market researcher wants to estimate the amount of money that a Christmass hopper will spend on…

A:

Q: In a survey, 18 people were asked how much they spent on their child's last birthday gift. The…

A: The summary of statistics is, x¯=30,s=16,n=18 The degree of freedom is, df=n-1   =18-1   =17…

Q: A psychologist wants to estimate the amount of math anxiety that the population of high school…

A:

Q: A psychologist wants to estimate the amount of math anxiety that the population of high school…

A: The psychologist wants to estimate the amount of math anxiety that the population of high school…

Q: Please answer math question

A: Solution: Let X be the diet lost. From the given information, n=42, x-bar=7.2 kg, S=3.9 kg and the…

Q: 19. Hospital Noise Levels Noise levels at various area urban hospitals were measured in decibels.…

A: Given n = 84X = 61.20 = 7.9z= 1.96 for 95% confidence interval

Q: On average, Americans have lived in 2 places by the time they are 18 years old. Is this average less…

A: Given Mean=2 x-bar=1.99 Standard deviations=0.3 n=62

Q: Parents of teenage boys often complain that auto insurance costs more, on average, for teenage boys…

A:

Q: o men take less time than women to get out of bed in the morning? The 43 men observed averaged 4.8…

A: Sample sizes n1=43 ,n2=46Sample means x1=4.8 ,x2=5NOTE: According to bartleby guidelines expert can…

Q: In this exercise, you will compare Chebyshev’s rule and the empirical rule. a. Compare the estimates…

A: a)The Chebyshev’s rule estimates at least 75% of observations lie within two standard deviations of…

Q: Scenario 3: On an examination given to students at a large number of different schools, the mean…

A: Formula

Q: A psychologist wants to estimate the amount of math anxiety that the population of high school…

A:

Q: A group of 70 Western Grey Squirrels were studied in Los Angeles . The sample mean of these…

A: We have given that,  Sample mean(x̄) = 1.73, sample size (n) = 70 and population standard deviation…

Q: 3. A taxi company claims that its drivers have an average of at least 12.4 years' experience. In a…

A: Givensample size(n)=15Mean(x)=11.2standard deviation(s)=2α=0.10

Q: you created a survey that measue Depression In you want to test people. the Claim that the mean.…

A: Solution-: Given: x¯=6.7,μ0=6.5,n=145,s=1.5 We test the claim that the mean measurement of…

Q: There are two major tests of readiness for college, the ACT and the SAT. ACT scores are reported on…

A:

Q: The standard deviation of the weights of elephants is known to be approximately 15 pounds. We wish…

A: Given: The value of n is 50. The value of σ is 11. The value of x is 244. The value of α is 0.05.

Q: A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older…

A: Given Data : Sample Size, n = 14.0 Sample Mean, x̄ = 82.1 standard…

Q: at one time had a height of 243 cm. The shortest living man at that time had a height of 127.5 cm.…

A: Concept: A z-score is known as the standard score that determines how much the data point deviates…