Suppose that the population standard deviation of student scores is 20. What will be the sample size so that the resulting 90% confidence interval for the population mean score has a margin of error no larger than 4?

Q: Suppose the population of IQ scores in the town or city where you live is bell-shaped, with a mean…

A: Solution-: Let, X= the population of IQ scores in the town Given: We find mean and standard…

Q: Suppose that the population standard deviation of students score is 20. what is the sample size so…

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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: Suppose we know that a confidence interval is (27,35), with a margin of error of 4. Find the sample…

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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 mean, if the sample size is 58, the sample mean is…

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Q: A research company wants to estimate the mean IQ score for the population of all high school…

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Q: The heights of 8 Japanese men were taken with sample mean of 155 cm (centimeters) and standard…

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Q: A simple random sample of 36 observations was taken from a large population. The sample mean and the…

A: The sample mean and the standard deviation are μ = 80 and σ = 12 respectively.Let X denotes the…

Q: the standard deviation of the weights of elephants is known to be approximately 15 pounds. We wish…

A: Obtain the 95% confidence interval for the mean weight of newborn elephant calves. The 95%…

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

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Q: Find the Confidence interval for the true Population Mean if a sample of 50 has a mean of 26.8 and a…

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Q: A simple random sample of 100 observations was taken from a large population. The sample mean and…

A: Given that ,                    sample size n=100                    Mean u=80…

Q: Find the critical t value to use in making a 90% confidence interval for a mean if the sample size…

A: Given, confidence level = 90.0 Need to find Critical value t

Q: A sample of 25 two-year-old chickens shows that they lay an average of 21 eggs per month. The…

A: Given, Sample size, n=25 mean, x =21 standard deviation, s=2   Formula for confidence interval( CI )…

Q: The distribution of study times for first-year students follows a normal distribution with a…

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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: 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 results of a common standardized test used in psychology research is designed so that the…

A: Given Population mean = 140 Population standard deviation = 40 Score =X= 44

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: confidence interval for a population mean is (56,78), with a margin of error of 11. What is the…

A: From provided information, Confidence interval for population mean is (56, 78), with margin of error…

Q: Find the error margin for a 98% confidence interval for the average value of Y when X is 9.

A: Given: The error margin for 98% confidence internal for the average value of Y when X is 9

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 simple random sample of 64 observations was taken from a large population.  The sample mean and…

A: Solution-: Given: n=64,x¯=320,s=120 We want to find the standard error of the sample mean=?

Q: Suppose we need to construct a 95% confidence interval for the mean of a normal population with…

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Q: Find the critical t value to use in making an 80% confidence interval for a mean if the sample size…

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Q: A simple random sample of 36 observations was taken from a large population. The sample mean and the…

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Q: Find the Margin of Error, if we are asked for 90% confidence interval where the mean is 52.3, the…

A: The provided information are: Confidence level = 90% Population standard deviation (σ)=2.15 Sample…

Q: If the sample mean is 37.7 and population standard deviation is = 9.2 and the sample size is 100…

A: Provided that the sample mean x¯=37.7 and the population standard deviation σ=9.2. The sample size…

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 heights of 9 men were taken with sample mean of 165 cm and standard deviation 5 cm. The heights…

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Q: Suppose that the population standard deviation of a student's score is 20. Choose a sample size so…

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Q: The president of a large university wishes to compare the standard deviation of the ages of students…

A: The sample size The sample mean The sample standard deviation To construct the 90% confidence…

Q: A survey of 30 adults found that the mean age of a person's vehicle is 3.6 years. Assuming the…

A: We have given that,  Sample mean (x̄) = 3.6, population standard deviation (σ) = 2 and sample size…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.