The weight of cell phones is normally distributed. The mean weight of a sample of 300 cell phones is 112 grams, with a standard deviation of 2 grams. With a 95% confidence level, determine the maximum error of estimate.

Q: The weights of salmon grown commercially are normally distributed with a standard deviation of 1.2…

A: Given information Sample mean = 7 pounds Population mean = 7.6 Sample size = 16 Population Standard…

Q: A sample of 16 scores has a standard error of 12. What is the standard deviation of the population…

A: The standard error of the mean is,

Q: A random sample of 25 bottles of Vitamin C contains, on average, 325.05 mg with a standard deviation…

A: Given,sample size(n)=25sample mean(x¯)=325.05sample standard deviation(s)=0.5degrees of…

Q: The weights of collected fruits are normally distributed, with a mean of 150 g and a standard…

A:

Q: A bottling company produces bottles that hold 10 ounces of liquid. The company gets complaints that…

A: Given that: μ=10 Number of samples: n= 24 Average of the liquid: x=9.8 standard deviation: σ=0.3

Q: the filling variance for boxes of cereal is designed to be .02 or less. a sample of 41 boxesof…

A:

Q: A quality control specialist for a restaurant chain takes a random sample of size 12 to check the…

A:

Q: The mean annual income of certified welders is normally distributed with a mean of $50,000 and a…

A: Solution: The shipbuilding association wishes to find out whether their welders earn more or less…

Q: The height of pyramids in Egypt is normally distributed. A sample of 125 pyramids had a mean height…

A: Given,      Sample size n=125      Meanx-=460.7      Standard deviation s=4.1      degrees of…

Q: The weights of college football players are normally distributed with a mean of 200 pounds and…

A:

Q: In an all boys school, the heights of the student body are normally distributed with a mean of 69…

A: By empirical rule, Approximately 68% of the data values lie within 1 standard deviation on each…

Q: The average standard deviation of the waiting time for a single queue is 4.7 minutes. The average…

A: The hypotheses for the test are given below: Null hypothesis: H0: σ=4.67. Alternative hypothesis:…

Q: The number of chocolate chips in an 18-ounce bag of chocolate chip cookies is approximately normally…

A: Givenmean(μ)=1252standard deviation(σ)=129

Q: When Brooklyn commutes to work, the amount of time it takes her to arrive is normally distributed…

A: Given that.   X~N( μ , ?^2 )   μ=54     , ?=4   Z-score =( x - μ )/?

Q: An investigator wants to estimate caffeine consumption in high school students. How many students…

A:

Q: If the manager of a bottled water distributor wants to estimate, with 95% confidence , the mean…

A:

Q: The mean score of a competency test is 73​, with a standard deviation of 4. Use the empirical rule…

A: Given: According to empirical rule

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 number of carbohydrates (in grams) per 8-ounce serving of yogurt for each of a random selection…

A: Given: X 17 42 41 20 39 41 35 15 43 25 38 33 42 23 17 25 34

Q: Use a 5% significance level to test the claim that the standard deviation of birthweights of girls…

A: The claim of the test is that the standard deviation of birth weights of girls is different from the…

Q: A sample of 8 items has an average fat content of 18.6 grams and a standard deviation of 2.4 grams.…

A: Given : μ = 18.6σ = 2.4n = 8 As standard deviation is known so we will apply z test 99% confidence…

Q: A chemical engineer claims that the average daily yield of a chemical manufactured in a chemical…

A: The standard error is,

Q: If the manager of a bottled water distributor wants to​ estimate, with 99​% ​confidence, the mean…

A:

Q: In order to estimate the average electric usage per month, a sample of 81 houses was selected and…

A: Given datasample size , n =81Population S.D , σ =310For 90% CIP(-z<μ<z) = 0.90∴ z=1.645…

Q: A community health plan wishes to estimate the mean number of visits per plan participant in a year.…

A: From the provided information, Margin of error (E) = ±1.8 Standard deviation (σ) = 2.8 The…

Q: 900 students were surveyed and had an average GPA of 2.7 with a standard deviation of 0.4. Calculate…

A: Given data,n=900Mean μ=2.7sd σ=0.4Z-value at 95% confidence is Zc=1.96 Calculate the margin of…

Q: In a sample of 90 large grade A eggs, the mean number of calories was 70 with a standard deviation…

A:

Q: given a standard deviation of + or - 0.023m at the 90% confidence level, what is the 68% error level…

A: The confidence level of the data is 90%. The standard deviation of the data with error percentage is…

Q: The mean score of a competency test is 69, with a standard deviation of 4. Use the empirical rule to…

A:

Q: During a natural gas shortage, a gas company randomly sampled residential gas meters in order to…

A: Solution: Let X be the gas consumption. From the given information, x-bar=250 cubic feet, S=50 cubic…

Q: Preliminary trials suggest that the standard deviation for the recovery time for the drug Xanzolam…

A: Given that, Preliminary trials suggest that the standard deviation for the recovery time for the…

Q: At a local restaurant, the amount of time that customers have to wait for their food is normally…

A:

Q: The amount of money raised by Clayton State teams for the Statistics Games is normally distributed,…

A: Chebyshev's theorem and empirical rule are used to calculate the percentages of data lies within…

Q: The average age of a sample of 17 South African women who attend yoga classes was found to be 31…

A:

Q: The standard deviation of a normal distribution is 20. What is the standard error of the mean…

A: from the given information,standard deviation(σ) =20.Sample size(n) = 225.

Q: A bottling company produces bottles that hold 10 ounces of liquid. Periodically, the company gets…

A: Given Information: Sample size (n) = 22 bottles Sample mean (x¯) = 9.7 ounces Sample standard…

Q: A medical researcher is interested in the prenatal care received by pregnant women in inner cities.…

A: A sample of 20 randomly selected women with children on the streets of Baltimore and the average…

Q: If the standard deviation of scores on the MCAT exam is 11.0, how large a sample is needed to…

A: The random variable score follows normal distribution. We have to find the sample size.

Q: The waiting time for patients at a local walk-in health clinic follows a normal distribution with a…

A: We have to find hypothesis..

Q: A popular soft drink is sold in 1-liter (1,000-milliliter) bottles. Because of variation in the…

A: A continuous random variable X is said to follow Normal distribution with parameters μ and σ2 if…

Q: The average salary of a male full professor at a public four-year institution offering classes at…

A: Solution: Let X be the salary of a male full professor. From the given information, X follows normal…

Q: A desktop PC uses 120 watts of electricity per hour based on 4 hours of use per day. Assume the…

A: Given that mu = 120 , s.d = 6,n=500 p(x<106 ) =?  approximately how many will use less than 106…

Q: The average hemoglobin reading for a sample of 20 LHS teachers was 16 g/100 ml, with a sample…

A: We need to find the 95% confidence interval for the given sample data.

Q: Find the 90% confidence interval for the variance and standard deviation of the ages of students at…

A: Confidence interval: The (1-α) % confidence interval for population standard deviation is given by:

Q: The standard deviation, S, for the annual medical cost of 24 households was found to equal $1689…

A: Suppose σ is the annual medical cost for all households.

Q: The mean score in miss smiths 4th grade class was 76, with a standard deviation of 7. Assume the…

A: Solution: Let X be the score in miss smiths 4thgrade class. From the given information, X follows…

Q: It is claimed that the average weight of a bag of the biscuit is 250 grams with a standard deviation…

A: We have the, Null Hypothesis(H0): μ=250, i.e the average weight of a bag of the biscuit is…

Q: Given that the population standard deviation is 1, determine the minimum sample size needed in order…

A: Given : population standard deviation = σ = 1 margin of error = E = 0.2 level of confidence = 95% At…