It is known that the amount of time needed to change the oil on a car is normally distributed with a standard deviation of 4 minutes. A random sample of 125 oil changes yielded a sample mean of 28 minutes. Compute the 97% confidence interval estimate for the population mean. Note: For each confidence interval, enter your answer in the form (LCL, UCL). You must include the parentheses and the comma between the confidence limits.   Confidence Interval =

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: If n = 100 and p (p-hat) = 0.9, construct a 95% confidence %3D interval. Give your answers to three…

A: Givensample size(n)=100p^=0.9α=1-0.95=0.05α2=0.025zc=zα2=z0.025=1.96   (from z table)

Q: If n = 280 and ô (p-hat) = 0.8, construct a 90% confidence interval. Give your answers to three…

A: given data sample size (n) = 280p^ = 0.890% ci p.

Q: A certain counselor wants to compare mean IQ scores for two different social groups. A random sample…

A: Given that    Sample sizes n1=13    , n2=11      Sample means X̄1=103      , X̄2=116      s1 =15…

Q: The number of cars sold annually by used car salespeople is normally distributed with a standard…

A: The provided sample mean number of cars sold annually is X¯=74 and standard deviation is σ=13. The…

Q: a 95% confidence interval estimate for population mean is determined to be 75.38 to 86.52. if the…

A: We have  to find the confidence level is reduced to 90%, the confidence interval will....

Q: If n=10, ī(x-bar)=37, and s=19, construct a confidence interval at a 95% confidence level. Assume…

A: From the provided information, Sample size (n) = 10 Sample mean (x̄) = 37 Standard deviation (s) =…

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: The heights of pine trees at a local tree farm are known to follow a normal distribution with a…

A: Given: Sample Sizen=99Sample MeanX=121Standard Deviationσ=7 The z value corresponding to the area…

Q: A physicist examines 4 seawater samples for iron concentration. The mean iron concentration for the…

A: Given dataSample size(n) = 4Sample mean = 0.185 cc/cubicSample standard deviation =…

Q: The mean and the standard deviation of a normal population are 11,795 and 14054 respectively. If n=…

A:

Q: Determine the point estimate of the population mean and margin of error for the confidence interval.…

A: Given               Lower Bound = 21               Upper Bound = 25 The point estimate of the…

Q: The number of television sets coming off a production line each day is known to have a standard…

A:

Q: A teacher gives a third grade class of n = 16 a reading skills test at the beginning of the school…

A: the beginning of the year". That is H0:μd=0

Q: If n=12, (x-bar)=33, and s=16, construct a confidence interval at a 80% confidence level. Assume 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: 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 random sample of 16 movies has been selected from a normally distributed population. If the mean…

A: Given that, a random sample of 16 movies has been selected from a normally distributed population.…

Q: Pete kept records of the fuel efficiency of his car. After the first 100 times he filled up the…

A:

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

A: Given:

Q: The number of cars sold annually by used car salespeople is normally distributed with a standard…

A:

Q: At a college, a popular achievement test is used for advanced college placement. Counselors selected…

A:

Q: We would like to construct a 90% confidence interval for the mean, based on a sample of 35…

A: Given data,Sample size n=35sample mean x=11sample sd is s=3.2Construct a 90% CI?

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

A:

Q: You measure 48 backpacks' weights, and find they have a mean weight of 72 ounces. Assume the…

A:

Q: Sales personnel for Skillings Distributors submit weekly reports listing the customer contacts made…

A: n=55,X¯=19.5,s=5.3

Q: For his senior project jerry wants to know the average gpa of students at his high school. He…

A: Here sample size is n= 21 And mean, X bar = 3.07  Standard deviation, s= 0.78 Confidence interval…

Q: A group of students go to a lake that you fished in, and caught 28 adult striped bass fish. The mean…

A: Obtain the 95% confidence interval for the population mean of adult striped bass for that lake. The…

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

A:

Q: If n = 180 and X = 144, construct a 99% confidence interval for the population proportion, p. Give…

A:

Q: f n=19, sample mean=50, and s =8, construct a confidence interval at a 99% confidence level. Assume…

A:

Q: If n = 530 and X = 424, construct a 99% confidence interval for the population proportion, p. Give…

A:

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: Find a Confidence interval for the true Population Proportions if n = 30,        x = 75, and the…

A: From the given information, X=75 and n=30.

Q: A medical doctor who wanted to study the heights of adult men and women took a random sample of 150…

A: Given n1=150 n2=120

Q: You are a data analyst for a health insurance company and want to estimate the population mean of…

A: The number of patients is 32.

Q: Estimate and report the number of meals you eat out per week. Assume the standard deviation is known…

A: The number of meals eaten by 10 individuals of a class are reported as follows: Individual No. of…

Q: One year, the mean age of an inmate on death row was 40.1 years. A sociologist wondered whether the…

A: Let μ and σ denote respectively the population mean and standard deviation of age of death-row…

Q: The dean randomly selected 33 students who took the calculus final exam and looked at their scores…

A:

Q: ou measure 32 backpacks' weights, and find they have a mean weight of 79 ounces. Assume the…

A: Solution: Given information: n= 32 Sample size  x= 79 ounces Sample mean σ=10.2 ounces Population…