What proportion of scores are below z-score of a +1.00 in a normal distribution?

Q: What is the probability of randomly selecting a z-score greater than z=-0.75 from a normal…

A: The normal distribution:A continuous random variable X is said to follow normal distribution if the…

Q: In a standard normal distribution, the mean is always 0 Does this suggest that half of the scores…

A: In a standard normal distribution, the mean is always 0 and the Standard deviation is always equal…

Q: True or False: For any normal distribution, 22.4% of the z-score values are greater than z =+.70

A: Solution: The given statement is that “For any normal distribution, 22.4% of the z-score values are…

Q: Describe the standard normal distribution. What are its characteristics?

A: Standard normal distribution curve is given.

Q: What percentage of z-scores in the standard normal distribution are greater than z = -1.40?

A:

Q: ) In a normal distribution, what is the z- score of an observation that is at the 39th percentile?

A: We have to find z score..

Q: When the sample size is over 30, when would the t test be used instead of normal distribution?

A: A t test will be used, when the population standard deviation is unknown and either the population…

Q: What percentage of z-scores in the standard normal distribution are greater than z = -.61?

A: If a random variable x has a distribution with mean µ and standard deviation σ, then the z-score is…

Q: percentage of scores lie within 2.34 standard deviations on both sides of the mean?

A: Standard normal distribution

Q: What is the probability of randomly selecting a z-score less than z = +2.25 from a normal…

A: Z=2.25  P(Z<2.25)= ?  Note: This probability value calculated from standard normal distribution…

Q: What is the special property of the standard normal distribution?

A: Standard normal distribution: The total area under the density curve is equal to 1.

Q: Explain the difference between binomial and normal distribution

A: It is asked to tell the difference between the binomial and normal distribution

Q: On a standard normal distribution, what percentage of scores lie within 2.94 standard deviations on…

A: To find the probability that a score lies within 2.94 standard deviations on both sides of the mean…

Q: Birna is studying the average height of male and female antelopes. The height of antelopes has been…

A: Given, Claim: The average height differs between the sexes. The test is two tailed. Given test…

Q: he mean of a normal distribution corresponds to a z-score of 1.    True  False

A: A z-score is a standardized value. Its distribution is the standard normal, Z ~ N(0, 1).

Q: What percentage of z-scores in the standard normal distribution are between z = -.20 and z = .40

A: Finding the p-value from z using excel

Q: What is the probability of randomly selecting a z-score less than z = 1.25 from a normal…

A: A normal distribution can be visualized by looking at the curve below. X-axis shows Z score which is…

Q: On a standard normal distribution, what percentage of scores lie within 2.89 standard deviations on…

A: We need to find the scores that lie within 2.89 standard deviations.

Q: Explain the Multivariate Normal Distribution?

A:

Q: Show the work to find the z-score boundaries that separate a normal distribution as described in the…

A: The z-score boundaries that separate a normal distribution as described in the middle 20% from the…

Q: Find two z-scores that bound the middle 40% of a normal distribution

A:

Q: How do i find the Z score boundaries that seperate a normal distribution as described in "The middle…

A: The total area is 100 % in Normal distributionMean Divides the whole area equally 50% on both…

Q: On a standard normal distribution, what percentage of scores lie within 1.29 standard deviations on…

A: Given that, Standard normal distribution.

Q: Explain why the percentage of all possible observations of a normally distributed variable that lie…

A: The x values delimiting the interval within two standard deviations from the mean are µ–2σ and…

Q: Find the​ Z-scores that separate the middle 50​% of the distribution from the area in the tails of…

A: We have to find the Z-scores that separate the middle 50​% of the distribution from the area in the…

Q: What z-score value separates the highest 10% of the scores in a normal distribution from the lowest…

A: We want to find highest 10% value for z score

Q: Find the​ Z-scores that separate the middle 64​% of the distribution from the area in the tails of…

A: Given information- We have given that middle area of the distribution is 64%. By using the standard…

Q: What z-score marks / cuts off the bottom 20% (approximately) of the standard normal distribution?

A: From the provided information, The z score cuts off the bottom 20% of the standard normal…

Q: Find the​ z-scores that separate the middle 95​% of the distribution from the area in the tails of…

A: Sketch the normal curve and the approximate ate area between -z and z under the normal curve.

Q: What are the main characteristics of the normal distribution? Why is it advantageous to use the Z…

A: There are 2 types of probability distribution which are stated as follows:Continuous probability…

Q: A researcher expects a treatment to produce an increase in the population mean. Assuming a normal…

A:

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.