Researchers wish to test the efficacy of a program intended to reduce the length of labor in childbirth. The accepted mean labor time in the birth of a first child is 15.3 hours. The mean length of labors for 20 first-time mothers in a pilot program was 13.1 hours with a sample standard deviation of 10.3 hours. Assuming a normal distribution of times of labor, construct a 95% confidence interval estimate for the population mean length of labor in childbirth for first-time mothers in the new program.

Q: While performing a strenuous task, the pulse rate of 25 workers increased on the average by 18.4…

A: Given that  Sample size n =25 Sample standard deviation s=4.9 Sample mean =18.4

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

A:

Q: In question 2 a 90% confidence interval was computed based on a sample of 250 adults. If the level…

A:

Q: In a service system at a bank, a sample of 40 customers is taken and the average waiting time is 12…

A: GivenMean(x)=12standard deviation(s)=2.4sample size(n)=40

Q: Conduct the test. Make a decision about the null hypothesis, interpret your results and calculate…

A: Xi                               Xi-X20                                   0.810…

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: A wildlife study is designed to find the mean weight of salmon caught by an Alaskan fishing company.…

A: Given information Standard deviation σ= 2.10 Confidence interval = 0.95 Significance level(α) = 1-…

Q: Apartment renting is one of the most affected business due to Covid Pandemic. It shows a reasonable…

A: Given that n=49 , alpha =0.05 ,x bar = 280 , sigma = 40 ,mu =295 Carry out hypothesis test to…

Q: In a random sample of 36 criminals convicted of a certain​ crime, it was determined that the mean…

A: Sample size (n) = 36 Mean x̅ = 69 Standard deviation (s) = 11 Significance level(α) = 1 - 0.90 =…

Q: Using traditional methods, it takes 11.5 hours to receive a basic flying license. A new license…

A: The sample size is 2020, sample mean is 11.6 hours and sample standard deviation is 1.6. The…

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: The eighth grade class at Middleton Middle School has 154 students total. Of those students, 71 are…

A: The two-way table is based on the frequency of two variables, where the variables are categorical in…

Q: en analyses of a chemical in soil gave a mean of 20.92 mg/kg and a standard deviation of 0.45 mg/kg.…

A: n=10x¯=20.92S=0.45CI=0.95α=1-0.95=0.05we have to find out the 95 % CI for the given data

Q: In a study of 120 post-menopausal women on hormone replacement therapy (HRT), there was a mean…

A: sample size(n)=120Mean ()=131standard deviation (s)=16.5confidence level=95%

Q: Suppose pizza delivery times are normally distributed. The population standard deviation is 7…

A: Given: Population standard deviation σ = 7  minutes. Sample mean X = 36 minutes. Sample size n = 20…

Q: To study the perceptions of waiting time, a researcher conducted a survey of 100 prospective…

A: The provided information  x¯=5.2σ=1.2n=100α=0.10The critical value is zc=1.64  (from statistical…

Q: Big babies: The National Health Statistics Reports described a study in which a sample of 315…

A:

Q: In a random sample of 29 people, the mean commute time to work was 31.5 minutes and the standard…

A: Given: Sample Size(n)=29 Mean(X¯)=31.5 Standard Deviation (S)=7.3

Q: The mean age when smokers first start is 13 years old with a population standard deviation of 1.8…

A: Given,sample size(n)=32sample mean(x¯)=12standard deviation(σ)=1.8α=0.01

Q: In a random sample of 41criminals convicted of a certain​ crime, it was determined that the mean…

A:

Q: A large urgent care center with 4 doctors found that they can see an average of 28 patients per…

A: We have given that Sample size (n) = 41Sample mean (x̅) = 28Standard deviations (s) =…

Q: assuming a standard deviation of $ 19,951 construct a 90% confidence interval for estimating the…

A: It is an important part of statistics. It is widely used.

Q: A random sample of 50 children 13 to 15 years old was obtained, and their daily consumption of iron…

A:

Q: 4. Overproduction of uric acid in the body can be an indication of cell breakdown. Over a period of…

A: Given information Sample size n = 8 Sample mean x̅ = 5.35 mg/dl Population standard deviation σ =…

Q: Amanda Reaves , a zookeeper, wants to estimate the average weight gain of elephants who are on a new…

A: Solution: From the given information, confidence level is 0.90, σ=5.50 and E=0.95.

Q: In estimating the average time spent per week in doing physical exercises, a random sample of 40…

A: We have given that,  Sample mean (x̄) = 4.0, standard deviation (s) = 1.0 and sample size (n) = 40…

Q: The operations manager of a large production plant would like to estimate the mean amount of time a…

A:

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: The International Air Transport Association surveys business travelers to develop quality ratings…

A: Givensample size(n)=50Mean(x)=3.34standard deviation(s)=2.163confidence interval = 95%

Q: In a random sample of 24 people, the mean commute time to work was 31.9 minutes and the standard…

A: Given, Sample size = n = 24mean = x = 31.9standard deviation = s = 7.2Level of significance = α =…

Q: A quality control manager at a light bulb factory needs to estimate the mean life of a large…

A:

Q: In a random sample of 28 ​people, the mean commute time to work was 33.3 minutes and the standard…

A: Suppose µ is the population mean commute time to work.

Q: We wish to give a 95% confidence interval for the mean time it takes to complete a routine assembly…

A: Point estimate of the population average is the sample average. That is, the population average is…

Q: A survey is being planned to determine the mean amount of time children watch television. A pilot…

A:

Q: An ambulance service located at the edge of town is responsible for serving a large office building…

A: It is given that: For the route A:  x¯=5.9sx=1.4n1=5 For the route B, y¯=4.2sy=1.8n2=6

Q: The number of eggs laid by a particular breed of hen during their laying season has a standard…

A: Margin of Error: margin of error of a point estimate provides the extent of accuracy with which the…

Q: A study revealed that the average time for a university graduate to find a job was 7.4 months, with…

A: It is given that, A study revealed that the average time for a university graduate to find a job was…