2. The principal of a large senior high school wants to estimate the average age of grade 11 students enrolled during summer. It is known from previous studies that the standard deviation is 2 years. A sample of 50 students shows the mean to be 17.4 years. Find the 95% confidence interval of the population mean.

Q: If a sample has a mean of 100 and a standard deviation of 6, what is the value in the data set that…

A:

Q: he sample mean for a recent introductory psychology test was 78, and the standard deviation was 3.…

A: Given Information: Mean = 78 Standard deviation = 3 Student received a score of 82 i.e., X = 82…

Q: 4. A recent study of 19 students of San Rafael College showed that the mean of the distance they…

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Q: An educational study to be conducted requires a test score in the middle 40% range. If the mean is…

A: Let us assume X=score Given that X follows a normal distribution with mean= 100 and standard…

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

A:

Q: What is the z-score for this raw score?

A: Let ,  Our aim is to find the Z-score .

Q: samples of n = 100 from

A:

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

A: Suppose that the random variable x defines the scores in psychology research.

Q: What is the raw z-score?

A: Given information Population Mean = mu= 120 Standard deviation = s= 50 Raw score = x =65 Z score = ?

Q: For a random sample of  70  overweight men, the mean of the number of pounds that they were…

A: given data  n = 70 x¯ = 28 poundsσ = 3.8 poundsbest point estimate for population mean  = ?

Q: The mean score of the students on pre-assessments is 10 and the standard deviation is 2. What was…

A:

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: If research samples 28 college students and wants to compare the sample mean of 8 to the population…

A: From the provided information, Sample size (n) = 28 Sample mean (x̄) = 8 Population mean (µ) = 12…

Q: A bank loan officer rates applicants for credit. The ratings can be described by a normal model with…

A: Given: μ = ​200 σ = 50

Q: What is the z-score for this raw score?

A:

Q: A student researcher wants to determine whether the mean score in Mathematics of the 25 students in…

A: Confidence interval are used to measure the range where the true parameter lies. It measure the…

Q: (a) between 56 and 74. % (b) above 68. % (c) below 56. %

A: here as per guideline i have calculated 3 subparts , plz repost for remainning. Suppose that the…

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Q: Miss Romero noted that the mean scores of a random sample of 15 Grade 8 students who had taken a…

A: Given: Sample size, n=15 Let PE denote point estimate Sample mean, x¯=80.5sample standard deviation,…

Q: Marian found that the average height of female students in her psychology class was 63 inches with a…

A: According to the provided data,

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

A:

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

A: From the provided information, Mean (µ) = 175 Standard deviation (σ) = 10 X~N (175, 10) Here X be a…

Q: Do you prefer taking tests on paper or online? A college instructor gave identical tests to two…

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Q: The Alpha company takes a survey of the age for all employees. The average age is 35 with a standard…

A: From the provided information, Mean (µ) = 35 Standard deviation (σ) = 3.2 Let X be a random variable…

Q: if you have a population standard deviation of 19 and a sample size of 4, what is your standard…

A: Given,standard deviation (σ)=19sample size(n)=4

Q: The Alpha company takes a survey of the age for all employees. The average age is 35 with a standard…

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Q: The mean for data set is 59, the standard deviation is 4, and the z- score is 0.03, what is the raw…

A: Here given that the mean =59, standard deviation=4, z score=0.04, we need to find the raw score x.

Q: A sociologist found that in a sample of 45 retired men, the average number of jobs they had during…

A: Given : population mean ,u = 7.2  population standard deviation,σ = 2.3

Q: 5 will be drawn from a population of test takers with a mean of 150 and standard deviation 9. Find…

A: Given that  Sample size (n) = 75 Population mean (μ) = 150 Standard deviation (σ) = 9   We know that…

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Q: Suppose a class average on a test is 75 and the standard deviation is 10. if joe scores 80 on the…

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