A corporation that owns apartment complexes wishes to estimate the average length of time residents remain in the same apartment before moving out. A sample of 150 rental contracts gave a mean length of occupancy of 3.7 years with a standard deviation 1.2 years. Which one of the following is a 95% confidence interval for the mean length of occupancy of apartments owned by this corporation before the resident moves out? O (1.726, 5.674) O (1.348, 6.052) O (3.508, 3.892) O (3.539, 3.861)

Q: The following table gives the age (in years) of 36 randomly selected U.S.millionaires. The sample…

A: Given The data is as follows: Sample size, n=36 Sample mean, x¯=58.53 Population standard deviation,…

Q: A sociologist found that in a sample of 49 retired police officers, the average number of jobs they…

A: sample size(n)=49 Mean(x)=7.2 standard deviation(s)=2.1 confidence level=99%

Q: The data were collected in the men's 100-meter run of 16 secondary school students, and the mean…

A: Introduction: The 100 (1 – α) % confidence interval for the population mean, μ, when the population…

Q: sample of 352 subscribers to Wired magazine shows the mean time spent using the Internet is 18.4…

A: Given data,n=352x=18.4s=6.8α=0.05df=n-1=351t-critical value is tc=1.967

Q: A 95% confidence interval for the mean hours freshmen spent on social media per day was calculated…

A: Solution: From the given information, the 95% confidence interval for the mean hours freshmen spent…

Q: Lifetimes of AAA batteries are approximately normally distributed. A manufacturer wants to estimate…

A: From the provided information, Sample size (n) = 18 Sample mean (x̅) = 11 Sample standard deviation…

Q: me that you have administered a worker satisfaction test to a random sample of 25 workers at your…

A: As the value of population standard deviation is known, we will use z-distribution. Given: Sample…

Q: 2. Over the past week, I measured the resting heartrates of 24 women ages 30 - 50 and got the…

A: From the provided information, Sample size (n) = 24 Level of significance (α) = 0.05

Q: A report said that the average blood pressure is  130.71  for a sample of  37  white males aged  35…

A:

Q: You collect a sample of 61 observations of animal heights, in mm. The sample mean is 65.19 and the…

A:

Q: A study found the temperature of 125 randomly selected healthy adults averaged 98.25 F with a…

A: It is given that sample mean is 98.25 and standard deviation is 0.733.

Q: A sample of 25 observations is taken from a normal distribution with unknown mean. The sample mean…

A:

Q: A study was commissioned to find the mean weight of the residents in certain town. The study…

A: Given: n=58, x=174 and s=38. Now,Degrees of freedom=n-1=58-1=57 Then, at 95% confidence level, the…

Q: A random sample of 100 observations produced a mean x̅ =38.5 and a standard deviation of 3.2. find a…

A: Given information Sample size(n) = 100 Sample mean x̅ =38.5 Sample standard deviation = 3.2…

Q: the following sample was taken from a normally distributed population: 20,27,15,2016,22 and 13. A…

A:

Q: A random sample of 110 Americans was asked how many hot dogs they eat each year.  The sample mean…

A:

Q: The health of the bear population in Yellowstone National park is monitored by periodic measurements…

A: Given Mean = 182.9 Standard deviation=121.8 n=54

Q: A study of 64 bolts of carpet showed that their average length was 75 yards. The standard deviation…

A:

Q: A random sample of 36 students at a community college showed an average age of 25 years. Assume the…

A: The summary of statistics is, Critical value: By using the z-tables, the critical value at 2% level…

Q: in a nigh school, the average class size of nine math class was 26.1 with a standard deviation of…

A: We have given that,  Sample mean (x̄) = 26.1, standard deviation (s) = 6.21 and sample size (n) = 9…

Q: The lead levels in a random sample of 35 crows in the region were measured and recorded. The mean…

A: It is given that  Sample size n = 35 Sample mean M = 4.50 Sample SD s = 1.12 Confidence level = 99%…

Q: Peter collects data on the music scores of 200 randomly selected concertos. The sample mean of this…

A: It is given that the mean is 85,252 and the standard deviation is 8,413.

Q: Measurements of the length of a random sample of 200 rods made by a certain machine  during one week…

A: Givensample size(n)=200Mean(x)=0.824standard deviation(s)=0.042α=1-0.95=0.05α2=0.025degrees of…

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: Mean or average used for measuring central tendency is also called as  a.

A: Mean or average used for measuring central tendency is also called as : Measures of Central tendency…

Q: A researcher takes a sample of 25 people and calculates a 90% confidence interval of (4,24) for a…

A: The confidence interval is (4,24).

Q: sample of 426 managers sent, on average 9.81, messages with a standard deviation of 14.41 messages.…

A: given data   sample size(n) = 426 sample standard deviation(s)  = 14.41construct 90% ci for σ.

Q: Salaries of 34 college graduates who took a statistics course in college have a​ mean, x​, of…

A: Given,   Sample size = 34 Sample mean = 66000 Population standard deviation = 19962   Since the…

Q: A study of 96 bolts of carpet showed that their average length was 77.5 yards. The standard…

A: GivenMean(x)=77.5sample size(n)=96standard deviation(s)=1.6α=1-0.99=0.01α2=0.005zα2=z0.05=2.58

Q: A quality control expert at a pretzel factory took a random sample of 10 bags from a production run…

A:

Q: To determine the views of students on a particular campus about fraternities, an 11-point attitude…

A:

Q: A study was commissioned to find the mean weight of the residents in certain town. The study…

A:

Q: Salaries of 43 college graduates who took a statistics course in college have a​ mean, x​, of…

A:

Q: 95​% confidence interval for the population mean is

A: A sample of 38 graduate students with mean number of months of work experience prior to entering an…

Q: The heights of a simple random sample of 400 male high school sophomores in a Midwestern state are…

A: We have given that  Sample size n =400 Sample mean =66.2 Population standard deviation =4.1

Q: An agriculture researcher plants twenty five plots with a new variety of corn. The average yielded…

A: Given that,   Critical value: By using the z-tables, the critical value at 10% level of…

Q: he mean GPA of all 45,038 students at Uneeda College is 3.21. A random sample of 50 GPAs from the…

A: given data  mean GPA of all 45,038 students at Uneeda College is 3.21. A random sample of 50 GPAs…

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: On the Stanford-Binet test, the mean IQ is 100. A class of 21 kindergarten pupils were tested with a…

A: Given  population mean μ=100, n=sample size=21, sample mean x̄=92, sample standard deviations s=6.92…

Q: In a sample of 7 observations, the values are 17, 11, 12, 13, 14, 15, 16. Find the 95% confidence…

A:

Q: A 95% confidence interval for the mean hours freshmen spent on social media per day was calculated…

A: Solution : sample size = 100 u = upper bound of confidence interval = 3.1 l = lower bound of…