3. A study of 25 residents showed that they had lived at their homes for 9.3 years. The standard deviation was 2 years. Find the 90% confidence interval (hint: the Tdistribution applies)

Q: suppose that 50 students were randomly sampled and their mean age was 30.4 years old. the population…

A:

Q: You measure 20 backpacks' weights, and find they have a mean weight of 76 ounces. Assume the…

A: sample size (n)=20Mean ()=76standard deviation ()=9.6confidence level=99%

Q: population mean turtle weight. r answers as decimals, to two places ounces

A: Since population standard deviation is known, the critical value at 99% confidence value will be…

Q: A group of 10 students from elementary school has their height measured. The sample mean is 119 cm…

A:

Q: A random sample of 59 four-year-olds attending daycare centers provided a yearly tuition average of…

A:

Q: In a test of the effectiveness of garlic for lowering cholesterol, 50 subjects were Next question…

A: Given : Sample Size, n = 50 Sample Mean, x̄ = 5.7 sample standard…

Q: For a random sample of 55 overweight men, the mean of the number of pounds that they were overweight…

A: It is given that the sample mean is 32 and the population standard deviation is 4.1.

Q: The 95% confidence interval for the population slope was calculated as (0.751,0.947). Based on the…

A: We have given  The confidence interval for slope is given to be (0.751, 0.947)

Q: You measure 23 turtles' weights, and find they have a mean weight of 71 ounces. Assume the popula…

A: Given that  Sample size n =23 Sample mean =71 Population standard deviation =11.3

Q: The mean hours of worked for United Airlines pilots is 46 hours/month based upon a sample of 25…

A: Given: Sample size, n=25 Sample mean, X=46 hours Sample standard deviation, s=3 hours The level of…

Q: Levels of insoluble ash (gm/kg) were measured in a sample of small (0.3 gm) aliquots of dried and…

A: Given information: The given confidence levels are: 95%, 90%, 85% The given confidence intervals…

Q: For a random sample of 55 overweight men, the mean of the number of pounds that they were overweight…

A: Given,sample size(n)=55sample mean(x)=32standard deviation(σ)=4.1α=1-0.90=0.1α2=0.05z0.05 =1.645

Q: You measure 25 turtles' weights, and find they have a mean weight of 45 ounces. Assume the…

A: The random variable turtle’s weight follows normal distribution. The sample size is 25. The sample…

Q: A 90% confidence interval for the population mean is (Use ascending order. Round to two decimal…

A: Let  be the population mean number of months of work experience.Given that,Sample size Sample mean…

Q: You measure 23 dogs' weights, and find they have a mean weight of 68 ounces. Assume the population…

A:

Q: You measure 35 backpacks' weights, and find they have a mean weight of 64 ounces. Assume the…

A: Mean weight =64 ouncesStandard deviation=4 ounces99% confidence interval i.e. 1% level of…

Q: A research scholar wants to know how many times per hour a certain strand of virus reproduces. The…

A: It is given that,Sample mean = 11.3.Population standard deviation, sigma is 2.3.The sample size, n…

Q: The mean length of all the telephone calls would have to be estimated. In sample of 14 calls, the…

A: Given:

Q: group of 10 students from elementary school has their height measured. The sample mean is 166 cm and…

A:

Q: You measure 49 backpacks' weights, and find they have a mean weight of 69 ounces. Assume the…

A: Solution:Given information:

Q: vey of 9 social networking sites has a mean of 13.74 million visitors for a specific month. The…

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

Q: A sample of 50 students was taken from the local university. These students spent an average of R170…

A: Given information- Sample size (n) = 50 Mean x̅ = R170 Standard deviation (s) = R25.50 Significance…

Q: How much more sensitive to contrast are athletes with eye grease than without eye grease? Give a 95%…

A:

Q: A sample of 31 cans of soup have a sample average of 102.1 mg of sodium with a sample standard…

A: It is given that the mean is 102.1 and the sample standard deviation is 4.7.

Q: Overweight Men For a random sample of 70 overweight men, the mean of the number of pounds that they…

A: The sample size is 70, the sample mean is 29 and the population standard deviation is 4.3.

Q: GPA of SMSU students is normally distributed with standard deviation (sigma) = 0.8. The average GPA…

A:

Q: You measure 45 turtles' weights, and find they have a mean weight of 62 ounces. Assume the…

A:

Q: If n = 5, T-46, and s= 13, construct a confidence interval at a 80% confidence level. Give your…

A:

Q: We have developed a series of questions to measure job satisfaction of bus drivers in London,…

A:

Q: In a recent study of 43 ninth-grade students, the mean number of hours per week that they played…

A: We have given that,  Sample mean (x̄) = 19.34, standard deviation of the population (σ) = 4.8 and…

Q: A random sample of 125 adult females was selected as part of a study on weight loss. The average…

A: Given: n=125, x=212 pounds, σ=18, α=1-0.95=0.05

Q: You measure 30 backpacks' weights, and find they have a mean weight of 78 ounces. Assume the…

A:

Q: 3. 500 hundred eggs were randomly chosen from a female Alaskan salmon and individually weighed. The…

A:

Q: If n = 220 and X = 176, construct a 95% confidence interval for the population proportion, p. Give…

A:

Q: For a random sample of  70  overweight men, the mean of the number of pounds that they were…

A: Here, n = 70, CL = 0.99, x=28, and σ=3.8

Q: You have a random sample of 30 mice, the mean of the number of pounds that they were eating was 5…

A: A confidence interval is a type of estimate computed from the statistics of the observed data. This…

Q: You measure 39 turtles' weights, and find they have a mean weight of 30 ounces. Assume the…

A: The mean is 30 and the population standard deviation is 7.8.

Q: A survey taken several years ago found that the average time a person reading a newspaper was…

A: Given:

Q: In a test of the effectiveness of garlic for lowering cholesterol, 45 subjects were treated with…

A: We have given that  Sample size n=45 Sample mean =3.3 , standard deviation =18.4 Degree of freedom =…

Q: At High Fashion shoe store, 23 randomly selected customers spend an average of 33.5 minutes shopping…

A: From the provided information,

Q: A sample of 22 public high school students spent an average of 7 hours studying per week. Assuming…

A:

Q: You measure 35 backpacks' weights, and find they have a mean weight of 64 ounces. Assume the…

A: n = 35x¯ = 64σ = 499% ci for μ = ?

Q: The CEO of battery manufacturing company claims that an average battery lasts 300 days. A researcher…

A: Given n=sample size=15, sample mean x̄=290, population mean μ=300 , sample standard deviations s=50…