A sample of size n = 20 is drawn from an approximately normal population whose standard deviation is 55.5. The sample mean is 52.4  construct a 95 confidence interval of

Q: A sample of 25 automobiles has a pollution by-product release standard deviation of 2.3 ounces when…

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Q: A sample of 60 people who were chosen for a sample had an average IQ score of 105. If the population…

A: From the given, x¯ (mean IQ score from sample)=105n (sample size)=60σ (population SD of IQ…

Q: A study of 40 bowlers showed that their average score was 180. The standard deviation of the…

A: Given n=sample size=40 x¯=sample mean=180 σ=population standard deviation=6 confidence level=0.95…

Q: Find a 90% confidence interval for the population standard deviation if you are given a sample of 10…

A: Given data : sample size,n = 10 df=n-1= 9 sample standard deviation,s= 3.0…

Q: The mean replacement time for a random sample of 12 microwave ovens is 8.6 years with a standard…

A: Given: n=12, x=8.6, s=3.6 and 1-α=95%. Then,α=1-95%=1-0.95=0.05 Also,The degree of…

Q: A random sample of 23 components is drawn from a population size of 100. The mean measurement of the…

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Q: The mean score of a random sample of 22 student applicants who took the college entrance examination…

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Q: use this to find a 95% confidence interval for the mean height of all red maple trees

A: The sample size is n = 146 Sample mean = 59 And sample SD = 12 Since the sample size is large then…

Q: mi/gallon. A simple random sample of 49 cars of this model is chosen and found to have a mean gas…

A: It is given that  Sample mean = 27.5 Population standard deviation = 4 Sample size = 49

Q: The total of individual weights of garbage discarded by 17 households in one week is normally…

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Q: A group of 10 surgery patients had a mean weight of 240 pounds with a sample standard deviation of…

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Q: For a random sample of 65 overweight men, the mean of number of pounds that they were overweight was…

A: Given, Sample size = 65 Sample mean = 32 Population standard deviation = 3.8   Since the population…

Q: random sample of 20 data points has a sample mean of 375 and a sample standard deviation of 81.…

A: Given that  Sample size n =20 Sample mean=375 Sample standard deviation =81

Q: A sample of 8 adult elephants had an average weight of x = 12300 pounds. The sample standard…

A: Given that, Mean = 12300 Standard deviation = 22 Sample size = 8

Q: The mean score of a random sample of 22 students’ applicants who took the college entrance…

A: Given :    Sample size (n) =22

Q: A researcher takes a sample of 25 people and calculates a 90% confidence interval of (4,24) for a…

A: The confidence interval is (4,24).

Q: A random sample of 5 months in an urban area showed an average of 28 mail carriers were bitten by…

A: Here we need to construct a 95% confidence interval for the mean number of mail carriers who were…

Q: A random sample of 250 students at a university finds that these students take a mean of 15 credit…

A: Solution: From the given information, the 99% confidence interval for the mean credit hours is…

Q: Find a 99% confidence interval for the mean of weights of Siamese cats if the population standard…

A: We have given that Sample mean (x̄) = 11.8, population standard deviation (σ) = 2.1 and sample size…

Q: 20 TV remote controls were followed over the years to find the mean lifespan of this model. The…

A: Answer - Here  n = 20 TV remote controls were followed  over the years to find the mean…

Q: A forestry researcher is conducting a study of trees in the upper midwest. He selects a random…

A: From the given information, n=125x¯=25s=5.2 Confidence level is 95%. Significance level is…

Q: The gas mileage for a certain model of car is known to have a standard deviation of 6 mi/gallon. A…

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Q: suppose a random sample of 25 observation from a normal population with standard deviation 6. Also…

A: From the provided information, Sample size (n) = 25 Standard deviation (σ) = 6 Mean (x̅) = 20…

Q: The mean score of a random sample of 22 students applicants who took the college entrance…

A: Following data is given The mean score of an entrance exam of 22 students is 76.9 and population…

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

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Q: A sample of 36 corn plants represent the height of corn in a corn field. The sample mean of corn…

A: Parameters are the numeric characteristic of population. There are mainly two types of estimations…

Q: A random sample of 9 observations from a normally distributed population produced a mean x̅ =12.4…

A: Given information Sample size(n) = 9 Sample mean x̅ = 12.4 Sample standard deviation = 2.8…