Give a 95% confidence interval for the true mean time students spent practicing for the play. x-bar=45.6 s=13.3 n=120

Q: Assume that the results are normally distributed. Pedro took an exam in a class in which the mean…

A: The formula for z-score is z = x - μσ where μ is the mean and σ is the standard deviation.…

Q: Compact fluorescent bulbs are more energy-efficient than incandescent bulbs, but they take longer to…

A: Given:  mean=μ=29.9 standard deviation = σ=4.9 we have to find z score for x=26.1

Q: Assume that adults have iq scores that are normally distributed with a mean of 100 and a standard…

A: Solution: Let X be the adults IQ score has normally distributed with mean μ=100 and standard…

Q: Compare the scores: a score of 220 on a test with a mean of 200 and a standard deviation of 21 and a…

A:

Q: A score that is 9 points above the mean corresponds to a z score of +1. What is the population…

A: As given: A score is 9 points above the mean.  It corresponds to a z score of +1.  It is required…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 99.2 and a standard…

A: Given info: IQ scores are normally distributed with a mean of μ=99.2 and a standard deviation…

Q: A correlation of 0.7 was found between time spent studying and percentage on an exam. What is the…

A: The correlation between time spent studying and percentage on an exam is 0.7. That is, r=0.7. The…

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 mean grade on a statistics exam is/M=82, the standard deviation is=12. What actual grade has a…

A: The normal distribution  in the center are generally denser and basically less denser at tails.…

Q: he scores on a recent midterm for Statistics is normally distributed.  The mean for a midterm exam…

A: Given that  The scores on a recent midterm for Statistics is normally distributed. Mean (μ) = 72…

Q: Scores on a test have a mean of 8181 and a standard deviation of 1313. Michael has a score of 9393.…

A:

Q: The mean score in a test is normally distributed with mean 30 and standard deviation 10. What is…

A: Given :  Mean, μ = 30 standard deviation, σ = 10 x = 55

Q: an exam score has a mean of 506 and a standard deviation of 100. What exam score corresponds to a…

A:

Q: Sally had a z score of +0.25 on a test with a mean of 62 and a standard deviation of 5. What was her…

A: From the provided information,Z score = +0.25

Q: set of scores ranges from a low of X = 25 to a high of X = 33 and has a mean of 29. Which of the…

A: GivenRange XMin= 25Range XMax= 33

Q: The mean of a data ser is 70. The standard deviation is 2. Between what Value is 95% of data found…

A:

Q: Assume that adults have iq scores that are normally distributed with a mean of 98.2 and a standard…

A:

Q: Let’s assume that weight is normally distributed with a mean of 160 and a standard deviation of 25…

A: Step-by-step procedure to obtain the middle 80% 0f all people lie between which two weights using…

Q: It takes an average of 9.1 minutes for blood to begin clotting after an injury. An EMT wants to see…

A: Sample size n=49Sample mean=8Standard deviation=3.31NOTE: according to bartleby guidelines expert…

Q: he scores on a standardized test are normally distributed with a mean of 115 and standard deviation…

A: The scores on a standardized test are normally distributed with Mean = 115 Standard deviation = 20

Q: Calculate the standard deviation of the data.

A: The given data is as follows:…

Q: Calculate the mean if -2 standard deviation = 70 and +2 standard deviation = 100. The mean of the…

A:

Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.