The average speed of 64 random cars traveling on a certain highway was 80 km/h and the sample standard deviation was 20 km/h. What is the margin of error with a 98% level of confidence for the population average speed? Select one: а. 1.295 b. 2.387 C. 6.64 d. 3.2375 е. 2.656 f. 5.9675

Q: The average salary of 64 employee was 5400 and the sample standard deviation was 280. Find the 90%…

A:

Q: The year Martina graduated college, she got a job as an entry-level software engineer working for a…

A: GivenMean(μ)=57000standard deviation(σ)=3700starting salary (x)=65000

Q: To compare the braking distances for two types of tires, a safety engineer conducts 35 braking tests…

A:

Q: A one-sample z-test was conducted in which the sample mean was 76, the population mean was 82, the…

A:

Q: Suppose that the sample dataset of July 1 temperatures consisted of 64 observations and that these…

A: given data standard deviation s = 4 sample size n = 64

Q: Consider a sample with a mean of 30 and a standard deviation of 5. Use Chebyshev's theorem to…

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Q: A test to measure the gullibility of college students is designed to have a mean of 70 and a…

A:

Q: A population has a standard deviation of 18. On average, how much differece should exist for a…

A:

Q: A random sample of 8 adults aged 30 years were asked how much they spent on medical costs in the…

A: After enable the MegaStat Add-In into EXCEL, enter the given data in EXCEL sheet.

Q: A reading specialist wanted to estimate the mean word length, in number of letters, for an…

A: Given data Sample size ,n=100 Sample mean  x ̅  =4.9 letters Sample SD , s=0.15 letters

Q: For a population with a mean of μ = 55 and a standard deviation of σ = 69, what is the standard…

A: Answer - For a population with a mean of μ = 55 and a standard deviation of σ = 69,             what…

Q: Please see attached.

A: (a). It is given that:

Q: Given a standard error of 5.2 with a sample size of 9. Then the standard deviation is

A: Solution: 4. From the given information, a standard error is 5.2 and n=9.

Q: A highway study of 8000 vehicles that passed by a checkpoint found that their speeds were normally…

A: Answer - A highway study of  N = 8000 vehicles that passed by a checkpoint found that their…

Q: Given a sample mean of 94.3, a sample standard deviation of 8.4 and a sample size of 6, test the…

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Q: The proportion of all high school students who watch national news is p = 0.57. A random sample of…

A: Given  p=0.57 n=60

Q: A bank wishes to estimate the mean credit card balance owed by its customers. The population…

A:

Q: If the mass of 35 dogs in your neighborhood were normally distributed, with a mean of 11.2 kg and a…

A: Given data: Mean = 11.2 kg Standard deviation = 2.8 kg

Q: Toby's Trucking Company determined that on an annual basis, the distance traveled per truck is…

A: It is given that the mean and standard deviation are 50,000 and 12,000, respectively.

Q: The average salary of 64 employee was 5400 and the sample standard deviation was 270. Find the 90%…

A:

Q: If the population standard deviation is σ=10, how large a sample is necessary to have a standard…

A: σ=10   The standard error is given by SE = σn n = (σSE)2

Q: A random sample of 8 adults aged 30years,were asked how much they spent of medication costsin the…

A: Given: Data in ascending order: 140,300,470,520,640,700,1200,5600 Sample Mean can be calculated as:…

Q: the average hardness of tablets is centered on the target of 6 kp, while LCL and UCL are 5 and 7…

A:

Q: Consider a sample with a mean of 500 and a standard deviation of 100. What are thez-scores for the…

A: Introduction: Consider X as a normally distributed random variable, with mean μ and standard…

Q: Suppose a real estate agent is interested in comparing the asking prices of condos in Montreal and…

A: The confidence interval is the interval range that helps to understand whether the test is…

Q: For a recent "Smartest State in America" article, a journalist wants to know how many people with a…

A: The mean is 5,000,000 and the standard deviation is 450,000.

Q: Light at Night and Weight Gain A study found that mice exposed to light at night gained…

A: Obtain the 90% confidence interval for the difference between two means. The 90% confidence interval…

Q: Consider a sample with a mean of 500 and a standard deviation of 100. What are the z-scores for the…

A: Consider that the sample mean and standard deviation of a random variable x are x̄ and s,…

Q: What is the smallest sample size required to provide a 95% confidence interval for a mean, if the…

A:

Q: for a sample of 150 that has a mean of 6540 and a standard deviation of .89, calculate the 95%…

A: It is given that mean and standard deviation are 6,540 and 0.89, respectively.

Q: The U.S. Department of Transportation provides the number of miles that residents of the 75 largest…

A: There are two independent populations. Those which are named as Buffalo residents and Boston…

Q: A travel agency wishes to estimate, at 99% confidence and to within $100, the mean airfare for…

A: According to the given information, we have Standard deviation = $275 Margin of error = $100…

Q: The National Health Statistics Reports dated Oct. 22, 2008, stated that for a sample size of 277…

A:

Q: Suppose a Realtor is interested in comparing the asking prices of midrange homes in Peoria,…

A: Given n1=21x¯1=116900s1=2300n2=26x¯2=114000s2=1750α=0.01

Q: The reading speed of second-grade students is approximately normal, with a mean of 90 words per…

A: a) The probability that a randomly selected student will read more than 95 words per minute is…

Q: for a sample of 57 that has a mean of 6200 and a standard deviation of 254, calculate the 95%…

A:

Q: The average salary of 64 employee was 5400 and the sample standard deviation was 260. Find the 90 %…

A:

Q: Salvatore, as the director of a regional bank, is concerned about the wait times of customers at the…

A: 48 patrons at each branch selected, For each branch means and standard deviation mentioned. We have…

Q: If a class took an exam and scored a mean of 82 with a standard deviation of 12, what would be the…

A: Given, Mean(x)=82Standard Deviation(s)=12

Q: The cell phone conversations of a random sample of 50 students has a standard deviation of 9.7…

A: Given: n=50σ=9.7CI=90%=0.90

Q: In a random sample of 50 people, the mean body mass index (BMI) was 27.7 and the standard deviation…

A: Given that the sample size is 50, the mean is 27.7 and the standard deviation is 6.12 a) Confidence…

Q: For a population with a mean of μ = 55 and a standard deviation of σ = 17, what is the standard…

A: We have to find correct answer..

Q: The following are grade point averages measured in a sample of 8 undergraduate students who are…

A: Solution: Let X be the grade point average. The given data is 3.28, 2.97, 3.05, 3.61, 3.39, 2.95, 3…

Q: A researcher was interested in comparing the amount of time spent watching television by women and…

A: A researcher was interested in comparing the amount of time spent watching television by women and…

Q: Toby's Trucking Company determined that on an annual basis, the distance traveled per truck is…

A: It is given that the mean and standard deviation are 50,000 and 12,000.

Q: In a survey of a group of​ men, the heights in the​ 20-29 age group were normally​ distributed, with…

A: Given: Mean μ=68.4 Standard deviation σ=4.0   a) Calculate the probability that the study…

Q: For a random sample of 25 students from a very large university, the accompanying table shows the…

A: From the provided information, Study time Number of students (f) 0 < 4 3 4 < 8…

Q: For a group of 20 students taking a PSDTF test, the mean heart rate was 96 beats per minute, and the…

A: Solution: Let X be the heart rate. From the given information, x-bar is 96 beats per minute, S=5 and…