A random sample of 25 business students required an average of 50.7 minutes to complete a statistics exam. Assume that the population standard deviation to complete the exam was 10.4 minutes. The 95% confidence interval around this sample mean is

Q: A random sample of 64 business students required an average of 100 minutes to complete a statistics…

A: Given that, Mean = 100 Standard deviation = 20 Sample size = 64 95% confidence level

Q: In a random sample of 60​ computers, the mean repair cost was​ $150 and assume that the population…

A: Given: In a random sample of 60​ computers, the mean repair cost was​ $150  the population…

Q: A group of 49 randomly selected students has a mean age of 22.4 years with a standard  deviation of…

A: Sample mean = x̅ = 22.4 Sample size = n = 49 Sample S.D = s = 3.8 Standard Error = s/√n  =…

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: In a random sample of six people, the mean driving distance to work was 24.9 miles and the standard…

A: The sample size: n=6 Sample mean: x¯=24.9 miles Standard deviation: s=7.9 Confidence level: C=0.99…

Q: In a random sample of eight ​people, the mean driving distance to work was 19.3 miles and the…

A: The question is about confidence interval Given : Randomly selected no. of people ( n ) = 8 Sample…

Q: were found to have an average weight of 9.7 ounces with a sample standard deviation is 0.20. Find…

A: As the population standard deviation is not known, we will use t distribution. Degrees of freedom…

Q: Suppose you use simple random sampling to select and measure 47 dogs' weights, and find they have a…

A: Given, mean is 78 and standard deviation is 13.5. Sample number is 47. We with use one sample z…

Q: The ages of registered voters in Smith County are normally distributed with a population standard…

A: Given:

Q: A sample of 22 households uses an average of 346.2 gallons of water per day, with a sample standard…

A: The sample size is 22, sample mean is 346.2 and sample standard deviation is 50.5.

Q: A local police department made an effort to determine the average speed of automobiles travelling…

A:

Q: A random sample of 51 four-year-olds attending day care centers provided a yearly tuition average of…

A:

Q: A random sample of 35 high-school students averaged 7.3 hours of sleep per night. Assume a…

A: Obtain the 95% confidence interval for the population mean. The 95% confidence interval for the…

Q: You measure 43 randomly selected textbooks' weights, and find they have a mean weight of 33 ounces.…

A: We have to find 95% confidence interval for the true population mean textbook weight.

Q: random sample of eight ​people, the mean driving distance to work was 23.6 miles and the standard…

A: Given, sample mean (x̄) = 23.6 sample standard deviation (s) = 5.1 sample size (n) = 8

Q: Justin is interested in buying a digital phone. He visited 14 stores at random and recorded the…

A: Solution 95% confidence interval for the mean price of this model of digital phone $302.478 to…

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

A: Given -  Sample size, n = 352 Mean time spent, x=18.4 hoursStandard deviation, σ=6.8 hours

Q: pharmaceutical company wanted to estimate the population mean of monthly sales for their 250 sales…

A: Sample size n=40Sample mean=10000Standard deviation=1000

Q: C. Find a 95% confidence interval for the average life time of all the television sets produced by a…

A:

Q: Suppose a sample of 30 LCC students are given an IQ test. The sample has a standard deviation of…

A: Given the following information- n=30s=12.24s2=149.82

Q: Construct a 90% Confidence Interval for the mean.

A: Let  be the population mean of water per day.Given that,Sample size Sample mean Sample standard…

Q: survey asked 8 adults how many years of education they had. The sample mean was 12.90 with a sample…

A:

Q: A random sample of 64 business students required an average of 50.7 minutes to complete a statistics…

A: Margin of Error E = z(alpha/2) * s / sqrt(n)Lower Bound = X - z(alpha/2) * s / sqrt(n)Upper Bound =…

Q: A business school placement director wants to estimate the mean annual salaries 5 years after…

A: Given: Sample size (n) = 25 Sample mean x¯ = 42740     Sample standard deviation (s) = 4780…

Q: A study found that the average time it took a person to find their dream home was 5.9 months. If a…

A: From the provided information, Sample size (n) = 36 Sample mean (x̅) = 5.9 months Population…

Q: 13 squirrels were found to have an average weight of 790 grams with a sample standard deviation of…

A: Given that  n=13 , Mean=X̄=790 , Standard deviation=S=8.3 95% confidence interval

Q: A sample of 22 public high school students spent an average of 6.5 hours studying per week. Assuming…

A: Given: Sample Sizen=22Sample MeanX=6.5Standard Deviationσ=2.3 The z value corresponding to…

Q: We take a simple random sample of 16 adults and ask them how long they sleep on atypical night. The…

A: The objective of this question is to calculate the 88% confidence interval for the true mean time…

Q: A sample of 22 public high school students spent an average of 6.5 hours studying per week. Assuming…

A:

Q: The prices of used books at a large college bookstore are normally distributed. If a sample of 23…

A:

Q: A medical researcher surveyed 9 hospitals and found that the standard deviation for the cost for…

A:

Q: You measure 46 textbooks' weights, and find they have a mean weight of 34 ounces. Assume the…

A: given data population sd(σ) = 14.3n = 46x¯ = 3495% ci for mean (μ) = ?

Q: A popular weight loss program claims users will lose weight each month. Linda samples 25 dieters and…

A: We have given that,  Sample mean (x̄) = 10 pounds, standard deviation (s) = 2 pounds and sample size…

Q: A study of 81 bolts of carpet showed that their average length was 77.5 yards. The standard…

A:

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: 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: company manufactures a certain over-the-counter drug. The company samples 80 pills and finds that…

A: We have given that  Sample size n = 80 Sample mean = 325.5 Standard deviation s=10.3 90%confidence…

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

A:

Q: college admissions officer takes a simple random sample of 80 entering freshmen and computes their…

A:

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

A:

Q: In a random sample of 60 refrigerators, the mean repair cost was $157.08. Assume the population…

A: Given that,The sample size is  refrigerators.The sample mean is The population standard deviation is…

Q: A nutritionist wants to determine how much time nationally people spend eating and drinking. Suppose…

A: Given, As per z-distribution table, the critical value of z at 0.05 level of significance is…

Q: A researcher is interested in finding a 98% confidence interval for the mean number of times per day…

A:

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…

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.