A random sample of 250 students at a university finds that these students take a mean of 15.3 credit hours per quarter with a standard deviation of 1.6 credit hours. Estimate the mean credit hours taken by a student each quarter using a 95% confidence interval?

Q: A recent study showed that the modern working person experiences an average of 2.1 hours per day of…

A: Confidence interval:The (1-α) % confidence interval for population mean µ, when σ is known is given…

Q: A random sample of 21 Camden County College students had a mean age of 24 years, with a standard…

A:

Q: A random sample of 250 students at a university finds that these students take a mean of 15.8 credit…

A: we have given that  n=250 ,xbar=15.8 ,sigma=2.3

Q: Assume that adults have IQ scores that are normally distributed with a mean of 96.6 and a standard…

A: Standard normal distribution: The standard normal distribution is a special case of normal…

Q: A study of commuting times reports the travel times to work of a random sample of 20 employed adults…

A: Given information- Sample size (n) = 20 Sample mean x̅ = 31.25 minutes Sample standard deviation (s)…

Q: A random sample of 250 students at a university finds that these students take a mean of 15.3 credit…

A: Given ,MeanX=15.3standard deviationσ=1.6sample sizen=250∝=1-0.95∝=0.05∝2=0.025 , z∝2=z0.05=1.96

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Q: A study shows that children watched television by an average of 48 hours per week with a standard…

A: A study shows that children watched television by an average of 48 hours per week with a standard…

Q: A group of 65 randomly selected students have a mean score of 30.6 with a standard deviation of 5.4…

A:

Q: A random survey of 85 death row inmates revealed that the mean length of time on death row is 17.8…

A: Answer: From the given data, Sample size (n) = 85 Sample mean x = 17.8 years Sample standard…

Q: A sample of 15 National Collegiate Athletics Association (NCAA) basketball players had an average…

A: we have give that : The sample mean is \bar X = 6Xˉ=6 and the sample standard deviation is s =…

Q: A recent study of 28 city residents showed that the mean of the number of years they lived at their…

A: The formula of confidence interval for the population mean is given by                  confidence…

Q: A recent survey of 8 social networking sites has a mean of 13.1 million visitors for a specific…

A: We ignore million while calculation.

Q: A group of 10 surgery patients had a mean weight of 240 pounds with a sample standard deviation of…

A:

Q: A recent survey of 8 social network sites has a mean of 13.1 million visitors for a specific month.…

A: Given that, Mean = 13.1 Standard deviation = 3.1 Sample size = 8

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

A: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

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

A: Standard deviation can not be negative.

Q: sample of 37 inchworms in Cititon Park was collected and measured. Their lengths had a mean of 2.56…

A: Given:  Sample size n=37  Sample mean(xbar) x¯ =2.56  Standard deviation( ?)=0.09  To find 95%…

Q: The mean score of a random sample of 60 students is 145 with a standard deviation of 40. Find the…

A:

Q: Find the 90% confidence interval for the standard deviation of the lengths of pipes if a sample of…

A: given data s = 10.2 n = 22 90% CI for σ = ? α = 1 - 0.90 = 0.10df = n - 1 = 21χ2L = χ21-α2,n-1…

Q: A random sample of 250 students at a university finds that these students take a mean of 15 credit…

A: Solution: From the given information, the 99% confidence interval for the mean credit hours is…

Q: 20 TV remote controls were followed over the years to find the mean lifespan of this model. The…

A: Answer - Here  n = 20 TV remote controls were followed  over the years to find the mean…

Q: Assume that adults have iq scores that are normally distributed with a mean of 97.9 and a standard…

A:

Q: An SRS of 27 students at NYU gave an average height of 5.4 feet and a standard deviation of .1 feet.…

A: Given that, An SRS of 27 students at NYU gave an average height of 5.4 feet and a standard deviation…

Q: a random of 15 lunch orders at noodles & company showed a mean bill of $14.48 with a standard…

A: I will use excel to solve this question.…

Q: A sample of 14 commuters in Chicago showed the average of the commuting times was 33.2 minutes. If…

A: Given that x bar =33.2.s.d =8.3,n=14,alpha=.05

Q: Assume that adults have IQ scores that are normally distributed with a mean of 104.8 and a standard…

A:

Q: A forestry researcher is conducting a study of trees in the upper midwest. He selects a random…

A: From the given information, n=125x¯=25s=5.2 Confidence level is 95%. Significance level is…

Q: A recent survey of 8 social network sites has a mean of 13.1 million visitors for a specific month.…

A: Given, Sample size = 8 Sample mean = 13.1 Sample standard deviation = 4.1   Since the population…

Q: A recent study of 25 motorists showed that they spent an average of 750 pesos per week. The standard…

A: We have to find  99% confidence interval of the true mean.

Q: A recent study of 25 motorists showed that they spent an average of P750 per week. The standard…

A: Given : s

Q: A random survey of 75 death row inmates revealed that the mean length of time on death row is 17.1…

A: From the provided information, Sample size (n) = 75 Sample mean (x̄) = 17.1 Standard deviation (s) =…

Q: 5 will be drawn from a population of test takers with a mean of 150 and standard deviation 9. Find…

A: Given that  Sample size (n) = 75 Population mean (μ) = 150 Standard deviation (σ) = 9   We know that…

Q: A random sample of 90 observations produced a mean of ?⎯⎯⎯=26.3 from a population with a normal…

A: The given data: Mean, x¯=26.3 Standard deviation,σ=2.08 Sample of observation, n=90  (a) 90%…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.